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LONDON, ENGLAND - DECEMBER 20: David, Viscount Linley and Serena, Viscountess Linley 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:  David, Viscount Linley and Serena, Viscountess Linley 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)