LONDON, ENGLAND - DECEMBER 20: Katherine, Duchess of Kent attends 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, UNITED KINGDOM - DECEMBER 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Lady Helen Taylor and Timothy Taylor 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)
Lord Nicholas Windsor, son of the Duke and Duchess of Kent, arriving for the Queen's Christmas lunch at Buckingham Palace, London. (Photo by Nick Ansell/PA Images via Getty Images)
LONDON, UNITED KINGDOM - DECEMBER 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) George Windsor, Earl of St Andrews and Sylvana Palma Windsor, Countess of St Andrews 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)
Lady Amelia Windsor and Lady Marina Windsor (right) arriving for the Queen's Christmas lunch at Buckingham Palace, London. (Photo by Nick Ansell/PA Images via Getty Images)
