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WINDSOR - JULY 23: Diana, Princess of Wales and Prince William attend Cartier International Polo Day on July 23, 1989 in Windsor, England . (Photo by Anwar Hussein/Getty Images)

WINDSOR - JULY 23: Diana, Princess of Wales and Prince William attend Cartier International Polo Day on July 23, 1989 in Windsor, England . (Photo by Anwar Hussein/Getty Images)