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Prince Richard of Gloucester and his new bride Birgitte van Deurs, brave the rain at St. Andrew's Parish Church, Barnwell, Northamptonshire. (Photo by PA Images via Getty Images)

Prince Richard of Gloucester and his new bride Birgitte van Deurs, brave the rain at St. Andrew's Parish Church, Barnwell, Northamptonshire.   (Photo by PA Images via Getty Images)

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Prince Richard of Gloucester and his new bride, Birgitte van Deurs at St. Andrew's Parish Church, Barnwell, Northamptonshire. (Photo by PA Images via Getty Images)

Prince Richard of Gloucester and his new bride, Birgitte van Deurs at St. Andrew's Parish Church, Barnwell, Northamptonshire.   (Photo by PA Images via Getty Images)

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Birgitte, Duchess of Gloucester and Prince Richard, Duke of Gloucester in the wedding car following their wedding ceremony in St Andrew's Church at Barnwell, Northamptonshire, England, 8th July 1972. (Photo by Daily Express/Hulton Archive/Getty Images)

Birgitte, Duchess of Gloucester and Prince Richard, Duke of Gloucester in the wedding car following their wedding ceremony in St Andrew's Church at Barnwell, Northamptonshire, England, 8th July 1972. (Photo by Daily Express/Hulton Archive/Getty Images)