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View of members of the British Royal family standing on the balcony at Buckingham Palace after the wedding of Princess Margaret to Antony Armstrong-Jones at Westminster Abbey in London on 6th May 1960. Princess Margaret and Earl Snowdon are pictured in the centre of the group with the Queen Mother and Queen Elizabeth II to the left. (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)

View of members of the British Royal family standing on the balcony at Buckingham Palace after the wedding of Princess Margaret to Antony Armstrong-Jones at Westminster Abbey in London on 6th May 1960. Princess Margaret and Earl Snowdon are pictured in the centre of the group with the Queen Mother and Queen Elizabeth II to the left. (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)