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Princess Anne helps her mother, Queen Elizabeth II, fit the bridle to the pony 'Greensleeves', the the grounds of Balmoral Castle during the Royal family's summer holiday in Scotland. (Photo by PA Images via Getty Images)

Princess Anne helps her mother, Queen Elizabeth II, fit the bridle to the pony 'Greensleeves', the the grounds of Balmoral Castle during the Royal family's summer holiday in Scotland.   (Photo by PA Images via Getty Images)