The Duchess of Cambridge has given birth to her second child - a girl.
The baby girl was delivered at 8.34am today weighing 8lbs 3oz, Kensington Palace confirmed.
Kate's daughter was delivered far quicker then her first child - with the baby being born less than three hours after she was admitted to hospital at 6am in the early stages of labour.
George took more than 10 hours to be born but it appears his sister might have taken less then half that time.
Speculation over when the Duchess would leave the hospital was prompted when her hairdresser, Amanda Cook Tucker, arrived at the Lindo Wing.
Kate is now expected to leave by 7pm, according to Kensington Palace.
Prince William left briefly to go home to pick up Prince George and bring him to visit his new baby sister.
The youngster has now returned to Kensington Palace for "bath and bed".
The huge numbers of journalists, photographers and broadcasters who had assembled outside the Lindo Wing were caught a little off guard by the speed of the announcement of the birth of the new Princess.
William leaves the Lindo Wing
Prince William and George arrive at the hospital
Town crier Tony Appleton - president of the Guild of International Millennium Town Criers - added a sense of drama to the occasion.
Standing on the steps of Lindo Wing and in a booming voice, he told the large crowds beginning to gather: "We welcome with humble duty the second-born of their Royal Highnesses the Duke and Duchess of Cambridge.
"The Princess is fourth in line to the throne."
Town crier Tony Appleton announces the news of the girl's birth
An easel was also placed in the Forecourt of Buckingham Palace to announce the birth .
The easel at Buckingham Palace
Kate was a number of days overdue and had been taken to the Lindo wing of St Mary's Hospital at 6am from her nearby home Kensington Palace.
Kensington Palace said in a statement: "Her Royal Highness The Duchess of Cambridge was safely delivered of a daughter at 8.34am. The baby weighs 8lbs 3oz.
"The Duke of Cambridge was present for the birth.
"The Queen, The Duke of Edinburgh, The Prince of Wales, The Duchess of Cornwall, Prince Harry and members of both families have been informed and are delighted with the news.
"Her Royal Highness and her child are both doing well."
The scene outside the Lindo Wing after the announcement
Kate and Prince William's first child Prince George was born on 22 July 2013 at the Lindo wing of St Mary’s Hospital in London.
All the party leaders tweeted their congratulations but the strangest reaction was from Nigel Farage, who said he was happy the baby's weight was announced in imperial measurements.
He said: "Imperial measurements, proper measurements - eight pounds three ounces.
"Not some horrid kilogramme measurement, I'm very, very pleased. Perhaps that tells us where the royal family really stand."
He added the birth of the royal baby was an "exciting and joyous event for millions of patriotic British people".
"I strongly urge all Ukip candidates to take at least an hour out of campaigning in order to toast the new arrival. I shall certainly be setting an example in that regard. After all, some things are worth interrupting politics for," he said.
The new baby is the second grandchild for heir to the throne Prince Charles.
The baby pushes Prince Harry down to fifth in line to the throne and she could one day be head of state of 16 countries (which is probably a lot of responsibility to be reckoning with on the first day of your life...)
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The baby girl is a princess, but only because of the Queen's intervention.
Under past rules limiting titles within the royal family, the girl would have been Lady Mountbatten-Windsor.
But the Queen issued a Letters Patent under the Great Seal of the Realm in December 2012 when Kate was around three months pregnant with George, declaring ''all the children of the eldest son of the Prince of Wales should have and enjoy the style, title and attribute of royal highness with the titular dignity of Prince or Princess prefixed to their Christian names or with such other titles of honour''.
When William is king, the new Princess might have the honorary style the Princess Royal - which is currently used by Princess Anne. It is customarily given by the sovereign to his or her eldest daughter.
Following a hospital spell for severe morning sickness, Kate continued with her royal engagements throughout the pregnancy, finishing with a visit to the Stephen Lawrence Centre in late March.
Royalists react outside the Lindo Wing to the news
Duchess Of Cambridge Labour - Live Images
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LONDON, ENGLAND - MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge depart the Lindo Wing with their newborn daughter at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34am this morning, weighing 8lbs 3 oz who will be fourth in line to the throne. (Photo by Danny Martindale/WireImage) (credit:Danny Martindale via Getty Images)
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Britain's Prince William, Duke of Cambridge, carries his newly-born daughter, his second child with Catherine, Duchess of Cambridge, as they leave the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / POOL / JOHN STILLWELL (Photo credit should read JOHN STILLWELL/AFP/Getty Images) (credit:JOHN STILLWELL via Getty Images)
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ALTERNATIVE CROP. Princess of Cambridge is carried by The Duke of Cambridge in a baby car seat outside the Lindo Wing of St Mary's Hospital in London. (credit:John Stillwell/PA Wire)
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LONDON, ENGLAND - MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge depart the Lindo Wing with their newborn daughter at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34 am this morning, weighing 8lbs 3 oz, who will be fourth in line to the throne. (Photo by Ben Pruchnie/FilmMagic) (credit:Ben Pruchnie via Getty Images)
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Britain's Catherine, Duchess of Cambridge holds her newly-born daughter, her second child with Britain's Prince William, Duke of Cambridge, as they show her to the media outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / POOL / JOHN STILLWELL (Photo credit should read JOHN STILLWELL/AFP/Getty Images) (credit:JOHN STILLWELL via Getty Images)
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LONDON, ENGLAND - MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge depart the Lindo Wing with their newborn daughter at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34am this morning, weighing 8lbs 3 oz who will be fourth in line to the throne. (Photo by John Stillwell - WPA Pool/Getty Images) (credit:WPA Pool via Getty Images)
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Britain's Prince William, Duke of Cambridge, and his wife Catherine, Duchess of Cambridge show their newly-born daughter, their second child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / POOL / JOHN STILLWELL (Photo credit should read JOHN STILLWELL/AFP/Getty Images) (credit:JOHN STILLWELL via Getty Images)
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Britain's Prince William, Duke of Cambridge, carries his newly-born daughter, his second child with Catherine, Duchess of Cambridge, as they leave the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
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Britain's Prince William, Duke of Cambridge, carries his newly-born daughter, his second child with Catherine, Duchess of Cambridge, as they leave the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / POOL / JOHN STILLWELL (Photo credit should read JOHN STILLWELL/AFP/Getty Images) (credit:JOHN STILLWELL via Getty Images)
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Britain's Catherine, Duchess of Cambridge holds her newly-born daughter, her second child with Britain's Prince William, Duke of Cambridge, as they show her to the media outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:BEN STANSALL via Getty Images)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge and Catherine, Duchess Of Cambridge depart the Lindo Wing with their new baby daughter at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34am this morning weighing 8lbs 3oz. (Photo by Mike Marsland/WireImage) (credit:Mike Marsland via Getty Images)
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LONDON, ENGLAND - MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge depart the Lindo Wing with their newborn daughter at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34am this morning, weighing 8lbs 3 oz who will be fourth in line to the throne. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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Britain's Prince William, Duke of Cambridge, and his wife Catherine, Duchess of Cambridge show their newly-born daughter, their second child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
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Britain's Prince William, Duke of Cambridge, and his wife Catherine, Duchess of Cambridge show their newly-born daughter, their second child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
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Britain's Prince William, Duke of Cambridge, and his wife Catherine, Duchess of Cambridge show their newly-born daughter, their second child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
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Britain's Prince William, Duke of Cambridge, and his wife Catherine, Duchess of Cambridge show their newly-born daughter, their second child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
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Britain's Prince William, Duke of Cambridge, walks with his wife Catherine, Duchess of Cambridge as she carries their newly-born daughter, their second child, out of the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge and Catherine, Duchess Of Cambridge depart the Lindo Wing with their new baby daughter at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34am this morning weighing 8lbs 3oz. (Photo by Mike Marsland/WireImage) (credit:Mike Marsland via Getty Images)
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LONDON, ENGLAND - MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge leave The Lindo Wing of St Mary's Hospital with their newborn daughter on May 2, 2015 in London, England. (Photo by Ian Gavan/Getty Images) (credit:Ian Gavan via Getty Images)
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LONDON, ENGLAND - MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge leave The Lindo Wing of St Mary's Hospital with their newborn daughter on May 2, 2015 in London, England. (Photo by Ian Gavan/Getty Images) (credit:Ian Gavan via Getty Images)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge and Catherine, Duchess Of Cambridge depart the Lindo Wing with their new baby daughter at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34am this morning weighing 8lbs 3oz. (Photo by Mike Marsland/WireImage) (credit:Mike Marsland via Getty Images)
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LONDON, ENGLAND - MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge leave The Lindo Wing of St Mary's Hospital with their newborn daughter on May 2, 2015 in London, England. (Photo by Ian Gavan/Getty Images) (credit:Ian Gavan via Getty Images)
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LONDON, ENGLAND - MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge leave The Lindo Wing of St Mary's Hospital with their newborn daughter on May 2, 2015 in London, England. (Photo by Ian Gavan/Getty Images) (credit:Ian Gavan via Getty Images)
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LONDON, ENGLAND - MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge leave The Lindo Wing of St Mary's Hospital with their newborn daughter on May 2, 2015 in London, England. (Photo by Ian Gavan/Getty Images) (credit:Ian Gavan via Getty Images)
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Britain's Prince William, Duke of Cambridge, and his wife Catherine, Duchess of Cambridge as they show their newly-born daughter, their second child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:BEN STANSALL via Getty Images)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge and his son Prince George return to the Lindo Wing at St Mary's Hospital on May 2, 2015 in London, England. The Duchess of Cambridge was safely delivered of a daughter at 8:34am this morning weighing 8lbs 3oz. (Photo by Mike Marsland/WireImage) (credit:Mike Marsland via Getty Images)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge and his son Prince George return to the Lindo Wing at St Mary's Hospital on May 2, 2015 in London, England. The Duchess of Cambridge was safely delivered of a daughter at 8:34am this morning weighing 8lbs 3oz. (Photo by Mike Marsland/WireImage) (credit:Mike Marsland via Getty Images)
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Prince William, Duke of Cambridge and Prince George of Cambridge outside St Mary's Hospital, Paddington, in the City of Westminster, London where the Duchess of Cambridge gave birth to a baby girl at 8.34am on 02/05/2015 weighing 8lbs 3oz.Mandatory Credit: Matt Crossick/ Empics Entertainment (credit:Matt Crossick/Matt Crossick)
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Prince William, Duke of Cambridge and Prince George of Cambridge outside St Mary's Hospital, Paddington, in the City of Westminster, London where the Duchess of Cambridge gave birth to a baby girl at 8.34am on 02/05/2015 weighing 8lbs 3oz.Mandatory Credit: Matt Crossick/ Empics Entertainment (credit:Matt Crossick/Matt Crossick)
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Prince William, Duke of Cambridge and Prince George of Cambridge outside St Mary's Hospital, Paddington, in the City of Westminster, London where the Duchess of Cambridge gave birth to a baby girl at 8.34am on 02/05/2015 weighing 8lbs 3oz.Mandatory Credit: Matt Crossick/ Empics Entertainment (credit:Matt Crossick/Matt Crossick)
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Prince William, Duke of Cambridge and Prince George of Cambridge outside St Mary's Hospital, Paddington, in the City of Westminster, London where the Duchess of Cambridge gave birth to a baby girl at 8.34am on 02/05/2015 weighing 8lbs 3oz.Mandatory Credit: Matt Crossick/ Empics Entertainment (credit:Matt Crossick/Matt Crossick)
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Prince William, Duke of Cambridge and Prince George of Cambridge outside St Mary's Hospital, Paddington, in the City of Westminster, London where the Duchess of Cambridge gave birth to a baby girl at 8.34am on 02/05/2015 weighing 8lbs 3oz.Mandatory Credit: Matt Crossick/ Empics Entertainment (credit:Matt Crossick/Matt Crossick)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge leaves St Mary's Hospital after the birth of his new daughter on May 2, 2015 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images) (credit:Mark Cuthbert via Getty Images)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge leaves St Mary's Hospital after the birth of his new daughter on May 2, 2015 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images) (credit:Mark Cuthbert via Getty Images)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge leaves the Lindo Wing after the birth of his newborn daugther at St Mary's Hospital on May 2, 2015 in London, England. (Photo by Ian Gavan/Getty Images) (credit:Ian Gavan via Getty Images)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge leaves the Lindo Wing after the birth of his newborn daugther at St Mary's Hospital on May 2, 2015 in London, England. (Photo by Ian Gavan/Getty Images) (credit:Ian Gavan via Getty Images)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge departs the Lindo Wing following the birth his second child at St Mary's Hospital on May 2, 2015 in London, England. (Photo by Samir Hussein/WireImage) (credit:Samir Hussein via Getty Images)
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Britain's Prince William, Duke of Cambridge (R), carrying his son Prince George of Cambridge returns to the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015 where his wife Catherine, Duchess of Cambridge, gave birth to their second child, a baby girl, earlier in the day. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:BEN STANSALL via Getty Images)
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Britain's Prince William waves as he leaves St. Mary's Hospital's exclusive Lindo Wing, London, Saturday, May 2, 2015. William's wife, Kate, the Duchess of Cambridge, gave birth to a baby girl on Saturday morning. (AP Photo/Matt Dunham) (credit:ASSOCIATED PRESS)
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Britain's Prince William drives away from St. Mary's Hospital's exclusive Lindo Wing, London, Saturday, May 2, 2015. William's wife, Kate, the Duchess of Cambridge, gave birth to a baby girl on Saturday morning. (AP Photo/Kirsty Wigglesworth) (credit:ASSOCIATED PRESS)
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Britain's Prince William leaves St. Mary's Hospital's exclusive Lindo Wing, London, Saturday, May 2, 2015. William's wife, Kate, the Duchess of Cambridge, gave birth to a baby girl on Saturday morning. (AP Photo/Matt Dunham) (credit:ASSOCIATED PRESS)
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Britain's Prince William waves and smiles as he leaves St. Mary's Hospital's exclusive Lindo Wing, London, Saturday, May 2, 2015. William's wife, Kate, the Duchess of Cambridge, gave birth to a baby girl on Saturday morning. (AP Photo/Matt Dunham) (credit:ASSOCIATED PRESS)
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Britain's Prince William, right, waves as he leaves the Lindo Wing, where his wife Kate, the Duchess of Cambridge, gave birth to their daughter at St. Mary's Hospital, London, Saturday, May 2, 2015. The Duchess gave birth to the Princess on Saturday morning. (AP Photo/Kirsty Wigglesworth) (credit:ASSOCIATED PRESS)
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Britain's Prince William, right, leaves the Lindo Wing, where his wife Kate, the Duchess of Cambridge, gave birth to their daughter at St. Mary's Hospital, London, Saturday, May 2, 2015. The Duchess gave birth to the Princess on Saturday morning. (AP Photo/Kirsty Wigglesworth) (credit:ASSOCIATED PRESS)
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Britain's Prince William waves to members of the public and the media as he leaves the Lindo Wing, where his wife Kate, the Duchess of Cambridge, gave birth to their daughter, at St. Mary's Hospital, London, Saturday, May 2, 2015. The Duchess gave birth to the Princess on Saturday morning. (AP Photo/Kirsty Wigglesworth) (credit:ASSOCIATED PRESS)
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The press and public watch town crier Tony Appleton announces the birth of the Duke and Duchess of Cambridge's second baby, a girl, at the Lindo Wing of St Mary's Hospital in London. (credit:Matt Crossick/Matt Crossick)
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The press and public watch town crier Tony Appleton announces the birth of the Duke and Duchess of Cambridge's second baby, a girl, at the Lindo Wing of St Mary's Hospital in London. (credit:Matt Crossick/Matt Crossick)
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LONDON, UNITED KINGDOM - MAY 02: Thousands of people line up for a chance to glimpse and photograph of the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. Catherine, Duchess of Cambridge delivered the baby girl at 8:34am Saturday and she is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: Thousands of people line up for a chance to glimpse and photograph the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. Catherine, Duchess of Cambridge delivered the baby girl at 8:34am Saturday and she is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: Thousands of people line up for a chance to glimpse and photograph the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. Catherine, Duchess of Cambridge delivered the baby girl at 8:34am Saturday and she is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: People photograph the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. Catherine, Duchess of Cambridge delivered the baby girl at 8:34am Saturday and she is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: Thousands of people line up for a chance to glimpse and photograph the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. The baby girl arrived at 8:34am Saturday and is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: Thousands of people line up for a chance to glimpse and photograph of the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. Catherine, Duchess of Cambridge delivered the baby girl at 8:34am Saturday and she is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: Tourists pose for photographs as Metropolitan Police officers keep an eye on the thousands of people lined up for a chance to glimpse and photograph the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. Catherine, Duchess of Cambridge delivered the baby girl at 8:34am Saturday and she is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: Two-year-old Fleur Burrows waves the Union Jack flag, joining thousands of people in front of Buckingham Palace after the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. Catherine, Duchess of Cambridge delivered the baby girl at 8:34am Saturday and she is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: Thousands of well-wishers gather in front of Buckingham Palace before the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child on May 2, 2015 in London, United Kingdom. The baby girl arrived at 8:34am Saturday and is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: Thousands of people line up for a chance to glimpse and photograph the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. The baby girl arrived at 8:34am Saturday and is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, ENGLAND - MAY 2: Well wishers gather to look at an easel that was placed in the forecourt of Buckingham Palace following the announcement that Catherine, Duchess of Cambridge has given birth to a baby girl at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34am this morning, weighing 8lbs 3 oz who will be fourth in line to the throne. (Photo by Steve Parsons - WPA Pool/Getty Images) (credit:WPA Pool via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: A Metropolitan Police officer attempts to clear people away from the front of Buckingham Palace before the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child on May 2, 2015 in London, United Kingdom. The baby girl arrived at 8:34am Saturday and is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: A Metropolitan Police officer attempts to clear people away from the front of Buckingham Palace as thousands of people line up for a chance to glimpse and photograph the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child on May 2, 2015 in London, United Kingdom. The baby girl arrived at 8:34am Saturday and is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: Thousands of people line up for a chance to glimpse and photograph the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. The baby girl arrived at 8:34am Saturday and is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, ENGLAND - MAY 2: A member of the crowd looks through the fence to view the easel that is placed in the forecourt of Buckingham Palace following the announcement that Catherine, Duchess of Cambridge has given birth to a baby girl at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34am this morning, weighing 8lbs 3 oz who will be fourth in line to the throne. (Photo by Steve Parsons - WPA Pool/Getty Images) (credit:WPA Pool via Getty Images)
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Members of the media gather outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015, after the news emerged that Catherine, Duchess of Cambridge, Prince William's wife, second child, a daughter, was born. The Duchess of Cambridge was safely delivered of a daughter, the Princess of Cambridge, weighing 8lbs 3oz, Kensington Palace announced Saturday. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images) (credit:JUSTIN TALLIS via Getty Images)
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Members of the media gather outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015, after the news emerged that Catherine, Duchess of Cambridge, Prince William's wife, second child, a daughter, was born. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced Saturday. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images) (credit:JUSTIN TALLIS via Getty Images)
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Two Toulon rugby team fans walk past the gathered media as Police guard the front entrance of the Lindo Wing of St. Mary's Hospital, after Kate, Duchess of Cambridge arrived to give birth to her second child in London, Saturday, May, 2, 2015. Toulon play Clermont Auvergne in London for the European Rugby Union Champions Cup, Saturday, in an all French final.(AP Photo/Alastair Grant) (credit:ASSOCIATED PRESS)
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Crowds gather as Tony Appleton, a town crier, announces to the assembled media the birth of the royal baby, outside the Lindo Wing, St. Mary's Hospital, London, Saturday, May 2, 2015. Kate, the Duchess of Cambridge, has given birth to a baby girl, royal officials said Saturday. (AP Photo/Tim Ireland) (credit:ASSOCIATED PRESS)
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An easel is placed in the forecourt of Buckingham Palace in London to announce the birth of the royal baby, Saturday, May 2, 2015. Kate, the Duchess of Cambridge, has given birth to a baby girl, royal officials said Saturday. (Steve Parsons/Pool via AP) (credit:ASSOCIATED PRESS)
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An easel is placed in the forecourt of Buckingham Palace in London to announce the birth of the royal baby, Saturday, May 2, 2015. Kate, the Duchess of Cambridge, has given birth to a baby girl, royal officials said Saturday. (Steve Parsons/Pool via AP) (credit:ASSOCIATED PRESS)
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LONDON, ENGLAND - MAY 02: Wellwishers and media gather following the announcement that Catherine, Duchess Of Cambridge has given birth to a baby girl, outside the Lindo Wing at St Mary's Hospital on May 2, 2015 in London, England. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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LONDON, ENGLAND - MAY 02: Wellwishers and media gather following the announcement that Catherine, Duchess Of Cambridge has given birth to a baby girl, outside the Lindo Wing at St Mary's Hospital on May 2, 2015 in London, England. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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An easel is placed in the forecourt of Buckingham Palace in London to announce the birth of the royal baby, Saturday, May 2, 2015. Kate, the Duchess of Cambridge, has given birth to a baby girl, royal officials said Saturday. (Steve Parsons/Pool via AP) (credit:ASSOCIATED PRESS)
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Town crier Tony Appleton holds a scroll as he makes an announment of the birth of Catherine, Duchess of Cambridge and Prince William's second child, a daughter, outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
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LONDON, ENGLAND - MAY 02: A Town Crier makes the announcement that Catherine, Duchess Of Cambridge has given birth to a baby girl, outside the Lindo Wing at St Mary's Hospital on May 2, 2015 in London, England. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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A royal fans holds up a sign the reads 'Its a princess' as they celebrate following the announcement of the birth of Catherine, Duchess of Cambridge and Prince William's second child, a daughter, outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images) (credit:JUSTIN TALLIS via Getty Images)
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Town crier Tony Appleton makes an announment of the birth of Catherine, Duchess of Cambridge and Prince William's second child, a daughter, outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images) (credit:JUSTIN TALLIS via Getty Images)
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Town crier Tony Appleton makes an announment of the birth of Catherine, Duchess of Cambridge and Prince William's second child, a daughter, outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images) (credit:JUSTIN TALLIS via Getty Images)
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LONDON, ENGLAND - MAY 02: Tony Appleton, the English town crier, announces the Duke and Duchess of Cambridge have given birth to a baby girl at St Mary's Hospital on May 2, 2015 in London, England. (Photo by Samir Hussein/WireImage) (credit:Samir Hussein via Getty Images)
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Tony Appleton, a town crier, announces to the assembled media the birth of the royal baby, outside the Lindo Wing, St. Mary's Hospital, London, Saturday, May 2, 2015. Kate, the Duchess of Cambridge, has given birth to a baby girl, royal officials said Saturday. (AP Photo/Alastair Grant) (credit:ASSOCIATED PRESS)
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Royal fans celebrate outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the news is passed that Catherine, Duchess of Cambridge and Prince William's second child, a daughter, was born. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
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Royal fans celebrate outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the news is passed that Catherine, Duchess of Cambridge, Prince William's wife, second child, a daughter, was born. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:BEN STANSALL via Getty Images)
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Betting odds are written on a chalkboard outside the Lindo Wing at St. Mary's Hospital in anticipation of Kate, Duchess Cambridge giving birth to her second child, London, Saturday, May 2, 2015. Prince William's wife Kate entered a London hospital Saturday to give birth to their second child, igniting a national wave of anticipation and a last-minute betting spree on the name of the new prince or princess. (AP Photo/Tim Ireland) (credit:ASSOCIATED PRESS)
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Royal fans celebrate outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the news is passed that Catherine, Duchess of Cambridge, Prince William's wife, second child, a daughter, was born. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:BEN STANSALL via Getty Images)
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A royal fan stands outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after Catherine, Duchess of Cambridge, Prince William's wife, was admitted to hospital on May 2 in the early stages of labour with her second child. The Duchess of Cambridge was safely delivered of a daughter, Kensington Palace announced. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:BEN STANSALL via Getty Images)
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Royal fans celebrate outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the news is passed that Catherine, Duchess of Cambridge, Prince William's wife, second child, a daughter, was born. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:BEN STANSALL via Getty Images)
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LONDON, ENGLAND - MAY 02: Nick Witchell of the BBC comments on live camera at the Lindo Wing after it was announced that the Duchess of Cambridge has gone into Labour at St Mary's Hospital on May 2, 2015 in London, England. Catherine, Duchess of Cambridge is expected to give birth at the Lindo wing sometime in the next couple of weeks. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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LONDON, ENGLAND - MAY 02: Media gather at the Lindo Wing after it was announced that the Duchess of Cambridge has gone into Labour at St Mary's Hospital on May 2, 2015 in London, England. Catherine, Duchess of Cambridge is expected to give birth at the Lindo wing sometime in the next couple of weeks. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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A man wearing a jacket with a British flag speak with media teams outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the announcement was made by Kensington Palace that the Duchess of Cambridge, Prince William's wife Kate was admitted to hospital on May 2 in the early stages of labour with her second child. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
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LONDON, ENGLAND - MAY 02: Media gather at the Lindo Wing after it was announced that the Duchess of Cambridge has gone into Labour at St Mary's Hospital on May 2, 2015 in London, England. Catherine, Duchess of Cambridge is expected to give birth at the Lindo wing sometime in the next couple of weeks. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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LONDON, ENGLAND - MAY 02: Max Foster of CNN broadcasts live from the Lindo Wing after it was announced that the Duchess of Cambridge has gone into Labour at St Mary's Hospital on May 2, 2015 in London, England. Catherine, Duchess of Cambridge is expected to give birth at the Lindo wing sometime in the next couple of weeks. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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LONDON, ENGLAND - MAY 02: Media gather at the Lindo Wing after it was announced that the Duchess of Cambridge has gone into Labour at St Mary's Hospital on May 2, 2015 in London, England. Catherine, Duchess of Cambridge is expected to give birth at the Lindo wing sometime in the next couple of weeks. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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Royal fan Terry Hutt waits outside the Lindo Wing at St. Mary's Hospital in anticipation of Kate, Duchess Cambridge giving birth to her second child, London, Saturday, May 2, 2015. Prince William's wife Kate entered a London hospital Saturday to give birth to their second child, igniting a national wave of anticipation and a last-minute betting spree on the name of the new prince or princess. (AP Photo/Tim Ireland) (credit:ASSOCIATED PRESS)
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LONDON, ENGLAND - MAY 02: Rhiannon Mills of Sky News broadcasts live from the Lindo Wing after it was announced that the Duchess of Cambridge has gone into Labour at St Mary's Hospital on May 2, 2015 in London, England. Catherine, Duchess of Cambridge is expected to give birth at the Lindo wing sometime in the next couple of weeks. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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Police guard the front entrance to the Lindo Wing of St Mary's Hospital as Kate, Duchess of Cambridge, has arrived and gone into labor to give birth to her second child, in London, Saturday, May 2, 2015. (AP Photo/Alastair Grant) (credit:ASSOCIATED PRESS)
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Police guard the front entrance to the Lindo Wing of St Mary's Hospital as Kate, Duchess of Cambridge, has arrived and gone into labor to give birth to her second child, in London, Saturday, May, 2, 2015. (AP Photo/Alastair Grant) (credit:ASSOCIATED PRESS)
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Police guard the front entrance to the Lindo Wing of St Mary's Hospital, and the media pens opposite as Kate, Duchess of Cambridge, has arrived and gone into labor to give birth to her second child in London, Saturday, May 2, 2015. (AP Photo/Alastair Grant) (credit:ASSOCIATED PRESS)
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LONDON, ENGLAND - MAY 02: Policemen wait outside the Lindo Wing after it was announced that the Duchess of Cambridge has gone into Labour at St Mary's Hospital on May 2, 2015 in London, England. Catherine, Duchess of Cambridge is expected to give birth at the Lindo wing sometime in the next couple of weeks. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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A chalkboard displays the latest betting odds on the name of Catherine, Duchess of Cambridge and Prince William's second child outside the entrance to the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the announcement was made by Kensington Palace that Catherine was admitted to hospital on May 2 in the early stages of labour. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images) (credit:JUSTIN TALLIS via Getty Images)
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Fans of French rugby union team Toulon sing songs outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the announcement was made by Kensington Palace that Catherine, Duchess of Cambridge, Prince William's wife, was admitted to hospital on May 2 in the early stages of labour with her second child. Toulon will play the European Champions Cup final at Twickenham against Clermont later on May 2. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images) (credit:JUSTIN TALLIS via Getty Images)
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LONDON, ENGLAND - MAY 02: Simon Viger of 5 uses Periscope at the Lindo Wing after it was announced that Catherine, Duchess of Cambridge has gone into Labour and is at St Mary's Hospital on May 2, 2015 in London, England. The Duchess is expecting her second child soon. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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LONDON, ENGLAND - MAY 02: Media gather at the Lindo Wing after it was announced that Catherine, Duchess of Cambridge has gone into Labour and is at St Mary's Hospital on May 2, 2015 in London, England. The Duchess is expecting her second child soon. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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LONDON, ENGLAND - MAY 02: Simon Viger of 5 and Dickie Arbiter use Periscope at the Lindo Wing after it was announced that the Duchess of Cambridge has gone into Labour at St Mary's Hospital on May 2, 2015 in London, England. Catherine, Duchess of Cambridge is expected to give birth at the Lindo wing sometime in the next couple of weeks. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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LONDON, ENGLAND - MAY 02: Fans dress in the Union Jack flag at the Lindo Wing after it was announced that Catherine, Duchess of Cambridge has gone into Labour and is at St Mary's Hospital on May 2, 2015 in London, England. The Duchess is expecting her second child soon. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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LONDON, ENGLAND - MAY 02: Children scooter by as police patrol at the Lindo Wing after it was announced that Catherine, Duchess of Cambridge has gone into Labour and is at St Mary's Hospital on May 2, 2015 in London, England. The Duchess is expecting her second child soon. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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Members of the media take their positions outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the announcement was made by Kensington Palace that Catherine, Duchess of Cambridge, Prince William's wife, was admitted to hospital on May 2 in the early stages of labour with her second child. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images) (credit:JUSTIN TALLIS via Getty Images)
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A broadcast journalist stands in front of the media pen outside the entrance to the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the announcement was made by Kensington Palace that Catherine, Duchess of Cambridge, Prince William's wife, was admitted to hospital on May 2 in the early stages of labour with her second child. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:BEN STANSALL via Getty Images)
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A cyclist passes by as police officers stand outside the entrance to the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the announcement was made by Kensington Palace that Catherine, Duchess of Cambridge, Prince William's wife, was admitted to hospital on May 2 in the early stages of labour with her second child. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:BEN STANSALL via Getty Images)
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LONDON, ENGLAND - MAY 02: Media gather at the Lindo Wing after it was announced that the Duchess of Cambridge has gone into Labour at St Mary's Hospital on May 2, 2015 in London, England. Catherine, Duchess of Cambridge is expected to give birth at the Lindo wing sometime in the next couple of weeks. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)