Princess Charlotte is giving the Duke and Duchess of Cambridge a "much easier time" than Prince George by sleeping through the night at only a couple of months old.
But it wasn't her parents who revealed the news.
Princes Charles made the announcement about his granddaughter at a Clarence House tea party for pilots and aircrew who fought in the Second World War.
According to the Mirror, Princes Charles recalled a conversation with his son, and said: "We were talking about grandchildren, he was saying Princess Charlotte does sleep through the night and it was much easier on mum then Prince George."
The Duke and Duchess of Cambridge have been looking after their daughter at their Norfolk home.
The couple recently released pictures of the baby princess being cuddled by her big brother, Prince George.
The photos show a cheeky Prince George looking happy and content as he puts his arm around his baby sister.
The Duke of Cambridge returned to work as a pilot at the beginning of June, after taking a month off with his newborn.
The couple announced they will christen Princess Charlotte on 5 July at St Mary Magdalene Church, Sandringham.
Princess Charlotte
Princess Charlotte Before Her First Birthday(01 of27)
Princess Charlotte of Cambridge looks up on a chair as her mother Catherine, Duchess of Cambridge takes her photo ahead of her first birthday on May 2, 2016 at Anmer Hall on April 2016 in Norfolk, England. The young Princess will celebrate her first birthday on May 2. (credit:HRH The Duchess of Cambridge)
Princess Charlotte Before Her First Birthday(02 of27)
Princess Charlotte of Cambridge looks up with her hands placed on a chair as her mother Catherine, Duchess of Cambridge takes her photo ahead of her first birthday on May 2, 2016 at Anmer Hall on April 2016 in Norfolk, England. The young Princess will celebrate her first birthday on May 2. (credit:HRH The Duchess of Cambridge)
Princess Charlotte Before Her First Birthday(03 of27)
Princess Charlotte of Cambridge looks up as her mother Catherine, Duchess of Cambridge takes her photo ahead of her first birthday on May 2, 2016 at Anmer Hall on April 2016 in Norfolk, England. The young Princess will celebrate her first birthday on May 2. (credit:HRH The Duchess of Cambridge)
Princess Charlotte Before Her First Birthday(04 of27)
Princess Charlotte of Cambridge looks on as she walks while pushing her toy blocks across the lawn outside as her mother Catherine, Duchess of Cambridge takes her photo ahead of her first birthday on May 2, 2016 at Anmer Hall on April 2016 in Norfolk, England. The young Princess will celebrate her first birthday on May 2. (credit:HRH The Duchess of Cambridge)
Prince George & Princess Charlotte Of Cambridge - Official Photographs Released(05 of27)
AMMER, ENGLAND - MAY 2015: In this undated handout image released by the Duke and Duchess of Cambridge, Prince George and Princess Charlotte at Anmer Hall in mid-May in Norfolk, England. (Photo by HRH The Duchess of Cambridge via Getty Images)NEWS EDITORIAL USE ONLY. NO COMMERCIAL USE (including any use in merchandising, advertising or any other non-editorial use including, for example, calendars, books and supplements). This photograph is provided to you strictly on condition that you will make no charge for the supply, release or publication of it and that these conditions and restrictions will apply (and that you will pass these on) to any organisation to whom you supply it. All other requests for use should be directed to the Press Office at Kensington Palace in writing. (credit:Handout via Getty Images)
Prince George & Princess Charlotte Of Cambridge - Official Photographs Released(06 of27)
AMMER, ENGLAND - MAY 2015: In this undated handout image released by the Duke and Duchess of Cambridge, Prince George and Princess Charlotte at Anmer Hall in mid-May in Norfolk, England. (Photo by HRH The Duchess of Cambridge via Getty Images)NEWS EDITORIAL USE ONLY. NO COMMERCIAL USE (including any use in merchandising, advertising or any other non-editorial use including, for example, calendars, books and supplements). This photograph is provided to you strictly on condition that you will make no charge for the supply, release or publication of it and that these conditions and restrictions will apply (and that you will pass these on) to any organisation to whom you supply it. All other requests for use should be directed to the Press Office at Kensington Palace in writing. (credit:Handout via Getty Images)
Prince George & Princess Charlotte Of Cambridge - Official Photographs Released(07 of27)
AMMER, ENGLAND - MAY 2015: In this undated handout image released by the Duke and Duchess of Cambridge, Prince George and Princess Charlotte at Anmer Hall in mid-May in Norfolk, England. (Photo by HRH The Duchess of Cambridge via Getty Images)NEWS EDITORIAL USE ONLY. NO COMMERCIAL USE (including any use in merchandising, advertising or any other non-editorial use including, for example, calendars, books and supplements). This photograph is provided to you strictly on condition that you will make no charge for the supply, release or publication of it and that these conditions and restrictions will apply (and that you will pass these on) to any organisation to whom you supply it. All other requests for use should be directed to the Press Office at Kensington Palace in writing. (credit:Handout via Getty Images)
Prince George & Princess Charlotte Of Cambridge - Official Photographs Released(08 of27)
AMMER, ENGLAND - MAY 2015: In this undated handout image released by the Duke and Duchess of Cambridge, Prince George and Princess Charlotte at Anmer Hall in mid-May in Norfolk, England. (Photo by HRH The Duchess of Cambridge via Getty Images)NEWS EDITORIAL USE ONLY. NO COMMERCIAL USE (including any use in merchandising, advertising or any other non-editorial use including, for example, calendars, books and supplements). This photograph is provided to you strictly on condition that you will make no charge for the supply, release or publication of it and that these conditions and restrictions will apply (and that you will pass these on) to any organisation to whom you supply it. All other requests for use should be directed to the Press Office at Kensington Palace in writing. (credit:Handout via Getty Images)
Britain Royal Baby(09 of27)
FILE - In this Saturday, May 2, 2015. file photo the newborn baby princess, born to parents Kate Duchess of Cambridge and Prince William, is carried in a car seat by her father from The Lindo Wing of St. Mary's Hospital, in London Britain's newborn princess has been named Charlotte Elizabeth Diana it was announced on Monday May 4. (John Stillwell/Pool via AP, File) (credit:ASSOCIATED PRESS)
Princess Charlotte Birth Certificate - 5/5/15(10 of27)
Photo by: KGC-375/STAR MAX/IPx 5/5/15 The birth certificate of Princess Charlotte of Cambridge which was signed by her father, Prince William The Duke of Cambridge at Kensington Palace today and witnessed by a Registrar from Westminster Register Office. (London, England, UK) (credit:KGC-375/STAR MAX/IPx)
Princess of Cambridge born at St. Mary's Hospital - 5/2/15(11 of27)
Photo by: KGC-107/STAR MAX/IPx The Princess of Cambridge is seen outside the Lindo Wing of St. Mary's Hospital with her parents Prince William The Duke of Cambridge and Catherine The Duchess of Cambridge. The Princess was born on Saturday, May 2nd, 2015 at 8:34 AM weighing 8lbs. 3oz. (Star Max/IPX via AP Images) (credit:KGC-107/STAR MAX/IPx)
Princess of Cambridge born at St. Mary's Hospital - 5/2/15(12 of27)
Photo by: KGC-03/STAR MAX/IPx 5/2/15 The Princess of Cambridge is seen outside the Lindo Wing of St. Mary's Hospital with her parents Prince William The Duke of Cambridge and Catherine The Duchess of Cambridge. The Princess was born on Saturday, May 2nd, 2015 at 8:34 AM weighing 8lbs. 3oz. (Star Max/IPX via AP Images) (credit:KGC-03/STAR MAX/IPx)
Princess of Cambridge born at St. Mary's Hospital - 5/2/15(13 of27)
Photo by: KGC-107/STAR MAX/IPx The Princess of Cambridge is seen outside the Lindo Wing of St. Mary's Hospital with her parents Prince William The Duke of Cambridge and Catherine The Duchess of Cambridge. The Princess was born on Saturday, May 2nd, 2015 at 8:34 AM weighing 8lbs. 3oz. (Star Max/IPX via AP Images) (credit:KGC-107/STAR MAX/IPx)
Princess of Cambridge born at St. Mary's Hospital - 5/2/15(14 of27)
Photo by: KGC-03/STAR MAX/IPx The Princess of Cambridge is seen outside the Lindo Wing of St. Mary's Hospital with her parents Prince William The Duke of Cambridge and Catherine The Duchess of Cambridge. The Princess was born on Saturday, May 2nd, 2015 at 8:34 AM weighing 8lbs. 3oz. (Star Max/IPX via AP Images) (credit:KGC-03/STAR MAX/IPx)
Princess of Cambridge born at St. Mary's Hospital - 5/2/15(15 of27)
Photo by: KGC-03/STAR MAX/IPx The Princess of Cambridge is seen outside the Lindo Wing of St. Mary's Hospital with her parents Prince William The Duke of Cambridge and Catherine The Duchess of Cambridge. The Princess was born on Saturday, May 2nd, 2015 at 8:34 AM weighing 8lbs. 3oz. (Star Max/IPX via AP Images) (credit:KGC-03/STAR MAX/IPx)
Princess of Cambridge born at St. Mary's Hospital - 5/2/15(16 of27)
Photo by: KGC-03/STAR MAX/IPx The Princess of Cambridge is seen outside the Lindo Wing of St. Mary's Hospital with her parents Prince William The Duke of Cambridge and Catherine The Duchess of Cambridge. The Princess was born on Saturday, May 2nd, 2015 at 8:34 AM weighing 8lbs. 3oz. (Star Max/IPX via AP Images) (credit:KGC-03/STAR MAX/IPx)
Princess of Cambridge born at St. Mary's Hospital - 5/2/15(17 of27)
Photo by: KGC-03/STAR MAX/IPx 5/2/15 The Princess of Cambridge is seen outside the Lindo Wing of St. Mary's Hospital with her parents Prince William The Duke of Cambridge and Catherine The Duchess of Cambridge. The Princess was born on Saturday, May 2nd, 2015 at 8:34 AM weighing 8lbs. 3oz. (Star Max/IPX via AP Images) (credit:KGC-03/STAR MAX/IPx)
Princess of Cambridge born at St. Mary's Hospital - 5/2/15(18 of27)
Photo by: KGC-03/STAR MAX/IPx The Princess of Cambridge is seen outside the Lindo Wing of St. Mary's Hospital with her parents Prince William The Duke of Cambridge and Catherine The Duchess of Cambridge. The Princess was born on Saturday, May 2nd, 2015 at 8:34 AM weighing 8lbs. 3oz. (Star Max/IPX via AP Images) (credit:KGC-03/STAR MAX/IPx)
Princess of Cambridge born at St. Mary's Hospital - 5/2/15(19 of27)
Photo by: KGC-03/STAR MAX/IPx 5/2/15 The Princess of Cambridge is seen outside the Lindo Wing of St. Mary's Hospital with her parents Prince William The Duke of Cambridge and Catherine The Duchess of Cambridge. The Princess was born on Saturday, May 2nd, 2015 at 8:34 AM weighing 8lbs. 3oz. (Star Max/IPX via AP Images) (credit:KGC-03/STAR MAX/IPx)
Princess of Cambridge born at St. Mary's Hospital - 5/2/15(20 of27)
Photo by: KGC-107/STAR MAX/IPx The Princess of Cambridge is seen outside the Lindo Wing of St. Mary's Hospital with her parents Prince William The Duke of Cambridge and Catherine The Duchess of Cambridge. The Princess was born on Saturday, May 2nd, 2015 at 8:34 AM weighing 8lbs. 3oz. (Star Max/IPX via AP Images) (credit:KGC-107/STAR MAX/IPx)
Princess of Cambridge born at St. Mary's Hospital - 5/2/15(21 of27)
Photo by: KGC-03/STAR MAX/IPx 5/2/15 The Princess of Cambridge is seen outside the Lindo Wing of St. Mary's Hospital with her parents Prince William The Duke of Cambridge and Catherine The Duchess of Cambridge. The Princess was born on Saturday, May 2nd, 2015 at 8:34 AM weighing 8lbs. 3oz. (Star Max/IPX via AP Images) (credit:KGC-03/STAR MAX/IPx)
Princess of Cambridge born at St. Mary's Hospital - 5/2/15(22 of27)
Photo by: KGC-03/STAR MAX/IPx 5/2/15 The Princess of Cambridge is seen outside the Lindo Wing of St. Mary's Hospital with her parents Prince William The Duke of Cambridge and Catherine The Duchess of Cambridge. The Princess was born on Saturday, May 2nd, 2015 at 8:34 AM weighing 8lbs. 3oz. (Star Max/IPX via AP Images) (credit:KGC-03/STAR MAX/IPx)
Princess of Cambridge born at St. Mary's Hospital - 5/2/15(23 of27)
Photo by: KGC-03/STAR MAX/IPx The Princess of Cambridge is seen outside the Lindo Wing of St. Mary's Hospital with her parents Prince William The Duke of Cambridge and Catherine The Duchess of Cambridge. The Princess was born on Saturday, May 2nd, 2015 at 8:34 AM weighing 8lbs. 3oz. (Star Max/IPX via AP Images) (credit:KGC-03/STAR MAX/IPx)
Princess of Cambridge born at St. Mary's Hospital - 5/2/15(24 of27)
Photo by: KGC-03/STAR MAX/IPx The Princess of Cambridge is seen outside the Lindo Wing of St. Mary's Hospital with her parents Prince William The Duke of Cambridge and Catherine The Duchess of Cambridge. The Princess was born on Saturday, May 2nd, 2015 at 8:34 AM weighing 8lbs. 3oz. (Star Max/IPX via AP Images) (credit:KGC-03/STAR MAX/IPx)
Princess of Cambridge born at St. Mary's Hospital - 5/2/15(25 of27)
Photo by: KGC-03/STAR MAX/IPx 5/2/15 The Princess of Cambridge is seen outside the Lindo Wing of St. Mary's Hospital with her parents Prince William The Duke of Cambridge and Catherine The Duchess of Cambridge. The Princess was born on Saturday, May 2nd, 2015 at 8:34 AM weighing 8lbs. 3oz. (Star Max/IPX via AP Images) (credit:KGC-03/STAR MAX/IPx)
Princess of Cambridge born at St. Mary's Hospital - 5/2/15(26 of27)
Photo by: KGC-107/STAR MAX/IPx 5/2/15 The Princess of Cambridge is seen outside the Lindo Wing of St. Mary's Hospital with her parents Prince William The Duke of Cambridge and Catherine The Duchess of Cambridge. The Princess was born on Saturday, May 2nd, 2015 at 8:34 AM weighing 8lbs. 3oz. (Star Max/IPX via AP Images) (credit:KGC-107/STAR MAX/IPx)
Princess of Cambridge born at St. Mary's Hospital - 5/2/15(27 of27)
Photo by: KGC-03/STAR MAX/IPx The Princess of Cambridge is seen outside the Lindo Wing of St. Mary's Hospital with her parents Prince William The Duke of Cambridge and Catherine The Duchess of Cambridge. The Princess was born on Saturday, May 2nd, 2015 at 8:34 AM weighing 8lbs. 3oz. (Star Max/IPX via AP Images) (credit:KGC-03/STAR MAX/IPx)