The Duke And Duchess Of Cambridge & Prince Harry Attend The Mix Christmas Party [Getty Images]

LONDON, ENGLAND - DECEMBER 19: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge with Prince Harry attend a Christmas party for volunteers at The Mix youth service on December 19, 2016 in London, England. The Mix youth service works with Their Royal Highnesses' Heads Together Campaign. (Photo by Chris Jackson/Getty Images)

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