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WINDSOR, UNITED KINGDOM - MAY 18: Queen Elizabeth Ll In Casual Clothes, Headscarf And Spectacles, Looking Anxious While Watching Her Husband Competing In The Cross Country Section Of The International Carriage Driving Grand Prix Championships At The Royal Windsor Horse Show. (Photo by Tim Graham Photo Library via Getty Images)

WINDSOR, UNITED KINGDOM - MAY 18:  Queen Elizabeth Ll In Casual Clothes, Headscarf And Spectacles, Looking Anxious While Watching Her Husband Competing  In The Cross Country Section Of The International Carriage Driving Grand Prix Championships At The Royal Windsor Horse Show.  (Photo by Tim Graham Photo Library via Getty Images)