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WINDSOR, UNITED KINGDOM - MAY 17: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II drives her Range Rover car as she watches the International Carriage Driving Grand Prix event on day 4 of the Royal Windsor Horse Show at Home Park on May 17, 2014 in Windsor, England. (Photo by Max Mumby/Indigo/Getty Images)

WINDSOR, UNITED KINGDOM - MAY 17: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II drives her Range Rover car as she watches the International Carriage Driving Grand Prix event on day 4 of the Royal Windsor Horse Show at Home Park on May 17, 2014 in Windsor, England. (Photo by Max Mumby/Indigo/Getty Images)