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LONDON, UNITED KINGDOM - DECEMBER 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Birgitte, Duchess of Gloucester and Prince Richard, Duke of Gloucester 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) Birgitte, Duchess of Gloucester and Prince Richard, Duke of Gloucester 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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The Duke and Duchess of Gloucester arriving for the Queen's Christmas lunch at Buckingham Palace, London. (Photo by Nick Ansell/PA Images via Getty Images)

The Duke and Duchess of Gloucester arriving for the Queen's Christmas lunch at Buckingham Palace, London. (Photo by Nick Ansell/PA Images via Getty Images)

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LONDON - FEBRUARY 2: Lady Rose Windsor (L), her sister Lady Davina Lewis (2nd L), the Earl of Ulster (R) and his wife Clare (2nd R) attend a memorial service for HRH Princess Alice at St. Clement Danes February 2, 2005 in London, England. Princess Alice died on October 29, 2004 at the age of 102, and her funeral was held last November. (Photo by Tim Graham Photo Library via Getty Images)

LONDON - FEBRUARY 2:  Lady Rose Windsor (L), her sister Lady Davina Lewis (2nd L), the Earl of Ulster (R) and his wife Clare (2nd R) attend a memorial service for HRH Princess Alice at St. Clement Danes February 2, 2005 in London, England. Princess Alice died on October 29, 2004 at the age of 102, and her funeral was held last November. (Photo by Tim Graham Photo Library via Getty Images)