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LONDON, ENGLAND - NOVEMBER 19: Countess Mountbatten of Burma, Prince Philip's cousin, accompanied by Mr. Michael-John Knatchbull, attends a service of thanksgiving at Westminster Abbey to celebrate the Queen and The Duke of Edinburgh's Diamond Wedding Anniversary, November 19, 2007 in London, England. (Photo by Tim Graham Photo Library via Getty Images)

LONDON, ENGLAND - NOVEMBER 19:  Countess Mountbatten of Burma, Prince Philip's cousin, accompanied by Mr. Michael-John Knatchbull, attends a service of thanksgiving at Westminster Abbey to celebrate the Queen and The Duke of Edinburgh's Diamond Wedding Anniversary, November 19, 2007 in London, England. (Photo by Tim Graham Photo Library via Getty Images)