The Duchess of Cambridge has gone into labour and has been admitted to hospital as she prepares to give birth to her first child, the future King or Queen.
Kate has been admitted to the Lindo Wing of St Mary's Hospital in Paddington, the hospital where Prince William was born 31 years before.
It is thought she entered the hospital around 6am this morning with Prince William. A Range Rover and Audi were spotted at the rear of the hospital and the couple are reported to have calmly entered through one of the hospital's side entrances.
Kensington Palace released a short statement: "The Duchess of Cambridge has been admitted this morning to St. Mary's Hospital, Paddington, London in the early stages of labour.
"The Duchess travelled by car from Kensington Palace to the Lindo Wing with The Duke of Cambridge."
While the great Kate baby wait continues, you can see the action outside the Lindo Wing with our live feed. Princess Diana was in labour with Prince William for 16 hours.
The Duke and Duchess of Cambridge have chosen not to find out the sex of their baby and the 31-year-old Duchess is believed to want a natural birth.
Bookmakers have been raking in the money with bets on everything from birth date, birth weight, hair colour and chosen baby names. Alexandra, Charlotte and Elizabeth are front-runners for a girl, while George and James are favourites for a boy.
As soon as the baby is born, a proclamation signed by the doctors who delivered the boy or girl will be rushed from the ward.
The sheet of creamy A4-size Buckingham Palace-headed paper will be brought out of the Lindo's front entrance by a press officer in a sealed envelope.
There it will then be placed on an easel, last used to announce Prince William's birth, by the main gates in the palace forecourt. It is expected that the announcement will contain the baby's birth weight and sex. The baby's name may not be announced until a later date.
The theatrical nature of the announcement is regarded as crucial by Buckingham Palace in order to retain a sense of dignity appropriate for the birth of an heir to the throne. No Twitter announcements for this grand occasion. If the baby is a girl, she will be the first woman to succeed to the throne before a potential subsequent brother.
Today is expected to be the hottest day of the year with temperatures in London of 35C. The Duchess of Cambridge has not been seen in public since the Trooping of the Colour in mid-June and had been staying with her parents, Kate and Michael Middleton, at their home in Bucklebury, Berkshire. The couple travelled to Kensington Palace, London on Friday.