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LONDON, ENGLAND - DECEMBER 05: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the Royal film performance of "Mandela: Long Walk To Freedom" held at the Odeon Leicester Square on December 5, 2013 in London, United Kingdom. (Photo by Karwai Tang/WireImage)

LONDON, ENGLAND - DECEMBER 05:  Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the Royal film performance of "Mandela: Long Walk To Freedom" held at the Odeon Leicester Square on December 5, 2013 in London, United Kingdom.  (Photo by Karwai Tang/WireImage)