Queen Elizabeth II, Prince Charles, Prince of Wales, Prince William, Duke of Cambridge and Prince George prepare special Christmas puddings in the Music Room at Buckingham Palace, London, as part of the launch of The Royal British Legion's Together at Christmas initiative on the 21st December 2019. Picture by Chris Jackson/WPA-Pool 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). The photograph must not be digitally enhanced, manipulated or modified in any manner or form and must include all of the individuals in the photograph when published.//GEORGEROGERS_002/1912221152

Princess Charlotte and Prince George pose on the steps of Kensington Palace before leaving for her first day of school at Thomas's Battersea, London, UK, on the 5th September 2019. Picture by Press Associaition/WPA-Pool//GEORGEROGERS_ROGERS0501/1909051913

Image licensed to i-Images Picture Agency. 08/06/2019. London, United Kingdom. Prince George and Princess Charlotte at Trooping the Colour in London. Picture by Stephen Lock / i-Images

A picture released by Kensington Palace on May 19, 2019 shows Britain's Prince William, Duke of Cambridge and Britain's Catherine, Duchess of Cambridge with their children Prince George (L), Princess Charlotte (C) and Prince Louis at the Adam White and Andree Davies co-designed 'Back to Nature' garden ahead of the RHS Chelsea Flower Show in London. (Photo by Matt Porteous / KENSINGTON PALACE / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / KENSINGTON PALACE / MATT PORTEOUS" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS - NO USE AFTER DECEMBER 31, 2019 - TO BE USED IN RELATION TO THE EVENTS MENTIONED IN CAPTION /

9/07/2018. London, United Kingdom. Prince George at the Chapel Royal, St James's Palace, London for the christening of his brother, Prince Louis. Picture by i-Images / Pool / eyevine

Embargoed until July 21, 2018 - 21:30 GMT / A handout picture released by Kensington Palace to mark Prince George's fifth birthday shows Prince George smiling to camera following his brother Prince Louis christening on July 9, 2018 at Clarence House in London. / AFP PHOTO / DUKE AND DUCHESS OF CAMBRIDGE / Matt Porteous / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / DUKE AND DUCHESS OF CAMBRIDGE / MATT PORTEOUS " - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS - NO USE AFTER DECEMBER 31, 2018 /

Britain's Prince George (C) accompanied by Britain's Prince William (L), Duke of Cambridge arrives for his first day of school at Thomas's school where he is met by Helen Haslem (R) head of the lower school in southwest London on September 7, 2017. / AFP PHOTO / POOL / RICHARD POHLE

Britain's Prince William accompanies Prince George as he is greeted by Helen Haslem - the head of the lower school as he arrives for his first day of school at Thomas's school in Battersea, London, Thursday, Sept. 7, 2017. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. (Richard Pohle/Pool Photo via AP)

Image licensed to i-Images Picture Agency. 08/07/2016. RAF Fairford, United Kingdom. The Duchess of Cambridge and Prince George at the Royal International Air Tattoo at RAF Fairford, United Kingdom. Picture by Stephen Lock / i-Images

This undated handout photo taken by Matt Porteous and released on July 22, 2016 by Britain's Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge shows Prince George at Sandringham in Norfolk. Prince George celebrates his third birthday today. / AFP PHOTO / DUKE AND DUCHESS OF CAMBRIDGE / Matt PORTEOUS / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / MATT PORTEOUS " - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS

Image licensed to i-Images Picture Agency. 29/09/2016. Victoria, Canada. Royal Tour of Canada -Day six. Prince William, The Duke of Cambridge, accompanied by his wife Catherine, The Duchess of Cambridge with their Children Prince George and Princess Charlotte, join parents and children from military families at a party at Government House, Victoria, Canada, on Day six of their eight day tour of Canada. Picture by i-Images / Pool

Prince George of Cambridge leaves his sister Charlotte's christening at St. Mary Magdalene Church in Sandringham, England, on July 5, 2015. Britain's baby Princess Charlotte was christened on Sunday in her second public outing since her birth nine weeks ago to proud parents Prince William and his wife Kate. The low-key ceremony took place in a church on the country estate of great grandmother Queen Elizabeth II. AFP PHOTO / POOL / CHRIS JACKSON

Image ??Licensed to i-Images Picture Agency. 17/07/2017. Warsaw, Poland. Duke and Duchess of Cambridge Tour of Poland. L to R Duchess of Cambridge's stylist Natasha Archer,nanny Maria Teresa Borrallo as Prince William, The Duke of Cambridge, joined by his wife Catherine, The Duchess of Cambridge with their two children Prince George and Princess Charlotte arrive at Warsaw airport, Poland, for a three day visit to the country. Picture by Andrew Parsons / i-Images

Image licensed to i-Images Picture Agency. 19/07/2017. Berlin, Germany. The Duke and Duchess of Cambridge with Prince George and Princess Charlotte arriving at Berlin airport in Germany on the third day of their Royal tour. Picture by Stephen Lock / i-Images

Image ??Licensed to i-Images Picture Agency. 25/12/2016. London, United Kingdom. Duke and Duchess of Cambridge Christmas Day Service. Englefield. Prince William, The Duke of Cambridge, Catherine, Duchess of Cambridge, with their children, Prince George and Princess Charlotte attend the morning Christmas Day service at St Mark's Church in Englefield, Berkshire. Picture by i-Images / Pool

Image ?Licensed to i-Images Picture Agency. 20/05/2017. London, United Kingdom. Pippa Middleton wedding to James Matthews. HRH The Duchess of Cambridge with her children HRH Prince George of Cambridge and HRH Princess Charlotte of Cambridge at the wedding of her sister Pippa Middleton and James Matthews at St Mark's Church, Englefield, Berkshire, UK. Picture by i-Images / Pool

Britain's Prince William and Kate, the Duchess of Cambridge with their children Prince George and Princess Charlotte arrive to attend the morning Christmas Day service at St Mark's Church in Englefield, England, Sunday Dec. 25, 2016. A heavy cold is keeping Queen Elizabeth II from attending the traditional Christmas morning church service near her Sandringham estate in rural Norfolk, England. (Andrew Matthews/PA via AP)

Image licensed to i-Images Picture Agency. 01/10/2016. Victoria, Canada. Prince George squashes his nose against the window of the seaplane as it takes off from Victoria Harbour, Canada at the end of the Royal Tour. Picture by Stephen Lock / i-Images

(L-R) Britain's Catherine, Duchess of Cambridge holding her daughter Princess Charlotte, Prince George, Britain's Prince William, Duke of Cambridge and Britain's Queen Elizabeth II stand on the balcony of Buckingham Palace to watch a fly-past of aircrafts by the Royal Air Force, in London on June 11, 2016. Trooping The Colour and the fly-past are part of a weekend of events to celebrate the Queen's 90th birthday. / AFP PHOTO / JUSTIN TALLIS

The Duke and Duchess of Cambridge and their children Prince George and Princess Charlotte arrive in Victoria, B.C., on Saturday, September 24, 2016. (Jonathan Hayward/The Canadian Press via AP)