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Tony Armstrong-Jones et la Princesse Margaret saluent depuis le balcon de Buckingham Palace le jour de leur mariage le 6 mai 1960 à Londres, Royaume-Uni. (Photo by Keystone-France/Gamma-Rapho via Getty Images)

Tony Armstrong-Jones et la Princesse Margaret saluent depuis le balcon de Buckingham Palace le jour de leur mariage le 6 mai 1960 à Londres, Royaume-Uni. (Photo by Keystone-France/Gamma-Rapho via Getty Images)

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The newly-wed Princess Margaret, the younger sister of Britain's Queen Elizabeth II, and her husband, the photographer Antony Armstrong-Jones wave 06 May 1960 from Buckingham Palace in London on their wedding day. Armstrong-Jones was later created Earl of Snowdon. They had two children, son Linley, and daughter Sarah, but announced their separation in March 1976. When the marriage was officially ended two years later, Margaret became the first royal to divorce since Henry VIII in the 16th century. (Photo credit should read /AFP/Getty Images)

The newly-wed Princess Margaret, the younger sister of Britain's Queen Elizabeth II, and her husband, the photographer Antony Armstrong-Jones wave 06 May 1960 from Buckingham Palace in London on their wedding day. Armstrong-Jones was later created Earl of Snowdon. They had two children, son Linley, and daughter Sarah, but announced their separation in March 1976. When the marriage was officially ended two years later, Margaret became the first royal to divorce since Henry VIII in the 16th century.  (Photo credit should read /AFP/Getty Images)

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Princess Margaret and Antony Armstrong-Jones emerge from the west door of Westminster Abbey in London to drive together to Buckingham Palace after their wedding ceremony. (Photo by PA Images via Getty Images)

Princess Margaret and Antony Armstrong-Jones emerge from the west door of Westminster Abbey in London to drive together to Buckingham Palace after their wedding ceremony.   (Photo by PA Images via Getty Images)