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LONDON, UNITED KINGDOM - DECEMBER 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince William, Duke of Cambridge, Prince George of Cambridge and Prince Harry attend a Christmas lunch for members of the Royal Family hosted by Queen Elizabeth II at Buckingham Palace on December 20, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - DECEMBER 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince William, Duke of Cambridge, Prince George of Cambridge and Prince Harry attend a Christmas lunch for members of the Royal Family hosted by Queen Elizabeth II at Buckingham Palace on December 20, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)

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LONDON, ENGLAND - DECEMBER 20: Prince William, Duke of Cambridge and Prince George of Cambridge with Prince Harry attend the annual Buckingham Palace Christmas lunch hosted by The Queen at Buckingham Palace on December 20, 2016 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

LONDON, ENGLAND - DECEMBER 20: Prince William, Duke of Cambridge and Prince George of Cambridge with Prince Harry attend the annual Buckingham Palace Christmas lunch hosted by The Queen at Buckingham Palace on December 20, 2016 in London, England.  (Photo by Mark Cuthbert/UK Press via Getty Images)

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LONDON, UNITED KINGDOM - DECEMBER 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince William, Duke of Cambridge, Prince George of Cambridge, Catherine, Duchess of Cambridge and Prince Harry attend a Christmas lunch for members of the Royal Family hosted by Queen Elizabeth II at Buckingham Palace on December 20, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - DECEMBER 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince William, Duke of Cambridge, Prince George of Cambridge, Catherine, Duchess of Cambridge and Prince Harry attend a Christmas lunch for members of the Royal Family hosted by Queen Elizabeth II at Buckingham Palace on December 20, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)