WINDSOR, ENGLAND - MAY 13: Queen Elizabeth II and Camilla, Duchess of Cornwall attend the Royal Windsor Horse show in the private grounds of Windsor Castle on May 13, 2015 in Windsor, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
WINDSOR, ENGLAND - MAY 13: Queen Elizabeth II and Camilla, Duchess of Cornwall attend the Royal Windsor Horse show in the private grounds of Windsor Castle on May 13, 2015 in Windsor, England. (Photo by Mark Cuthbert/UK Press via Getty Images)