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Britain's Queen Elizabeth II is greeted by Britain's Prince Charles, Prince of Wales as she arrives to attend the final night of The Queen's 90th Birthday Celebrations at the Royal Windsor Horseshow in the grounds of Windsor Castle, west of London on May 15, 2016. The event tells the remarkable story of The Queens life encompassing a reign spanning more than 60 years. The sovereign last year overtook her great-great-grandmother queen Victoria to become Britain's longest-serving monarch. / AFP / Leon NEAL (Photo credit should read LEON NEAL/AFP/Getty Images)

Britain's Queen Elizabeth II is greeted by Britain's Prince Charles, Prince of Wales as she arrives to attend the final night of The Queen's 90th Birthday Celebrations at the Royal Windsor Horseshow in the grounds of Windsor Castle, west of London on May 15, 2016. The event tells the remarkable story of The Queens life encompassing a reign spanning more than 60 years. The sovereign last year overtook her great-great-grandmother queen Victoria to become Britain's longest-serving monarch. / AFP / Leon NEAL (Photo credit should read LEON NEAL/AFP/Getty Images)
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