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WINDSOR, ENGLAND - MAY 13: Prince William, Duke of Cambridge (L) and Emma Watson attend a dinner to celebrate the work of The Royal Marsden hosted by the Duke of Cambridge on May 13, 2014 in Windsor, England. (Photo by Doug Seeburg-Pool/Getty Images)

WINDSOR, ENGLAND - MAY 13:   Prince William, Duke of Cambridge (L) and Emma Watson attend a dinner to celebrate the work of The Royal Marsden hosted by the Duke of Cambridge on May 13, 2014 in Windsor, England.  (Photo by Doug Seeburg-Pool/Getty Images)