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LONDON, UNITED KINGDOM - JULY 14: The Wedding Of Lady Sarah Armstrong-jones To Daniel Chatto At St Stephen Walbrook Church. (Photo by Tim Graham Photo Library via Getty Images)

LONDON, UNITED KINGDOM - JULY 14:  The Wedding Of Lady Sarah Armstrong-jones To Daniel Chatto At St Stephen Walbrook Church.  (Photo by Tim Graham Photo Library via Getty Images)

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Lord Linley (foreground, left) as a pageboy with his sister, Lady Sarah Armstrong Jones as a bridesmaid, children of Princess Margaret and Anthony Armstrong-Jones, during a wedding at St Margaret's Church in London on 10th February 1969. This image is one of a series taken by Ray Bellisario who was credited with being the "original paparazzo" and someone who frequently upset the Royal Family with his informal and often unwelcome style of photography. (Photo by Ray Bellisario/Popperfoto via Getty Images/Getty Images)

Lord Linley (foreground, left) as a pageboy with his sister, Lady Sarah Armstrong Jones as a bridesmaid, children of Princess Margaret and Anthony Armstrong-Jones, during a wedding at St Margaret's Church in London on 10th February 1969. This image is one of a series taken by Ray Bellisario who was credited with being the "original paparazzo" and someone who frequently upset the Royal Family with his informal and often unwelcome style of photography.  (Photo by Ray Bellisario/Popperfoto via Getty Images/Getty Images)

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GREAT BRITAIN - JULY 29: Diana, Princess of Wales and Prince Charles, Prince of Wales on their wedding day at St Paul's Cathedral, Sarah Armstrong-Jones is the bridesmaid behind them (Photo by Tim Graham Photo Library via Getty Images)

GREAT BRITAIN - JULY 29:  Diana, Princess of Wales and Prince Charles, Prince of Wales on their wedding day at St Paul's Cathedral, Sarah Armstrong-Jones is the bridesmaid behind them  (Photo by Tim Graham Photo Library via Getty Images)

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LONDON, UNITED KINGDOM - JULY 14: Bride Sarah Armstrong-Jones daughter of Britain's Princess Margaret and Lord Snowdon with her groom Daniel Chatto after their wedding at St Stephen Walbrook in the City 14 July 1994. Many members of the British Royal Family attended the ceremony. (FILM) (Photo credit should read ADRIAN CLACK/AFP/Getty Images)

LONDON, UNITED KINGDOM - JULY 14:  Bride Sarah Armstrong-Jones daughter of Britain's Princess Margaret and Lord Snowdon with her groom Daniel Chatto after their wedding at St Stephen Walbrook in the City 14 July 1994. Many members of the British Royal Family attended the ceremony. (FILM)  (Photo credit should read ADRIAN CLACK/AFP/Getty Images)