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Anne, the Princess Royal and Mark Phillips pose on the balcony of Buckingham Palace in London, UK, after their wedding, 14th November 1973. Also pictured are Queen Elizabeth II and the Queen Mother. (Photo by Fox Photos/Hulton Archive/Getty Images)

Anne, the Princess Royal and Mark Phillips pose on the balcony of Buckingham Palace in London, UK, after their wedding, 14th November 1973. Also pictured are Queen Elizabeth II and the Queen Mother.  (Photo by Fox Photos/Hulton Archive/Getty Images)