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LONDON, ENGLAND - MARCH 09: Prince Charles, Prince of Wales and his fiance, Lady Diana Spencer, wearing a strapless black taffeta dress designed by David and Elizabeth Emanuel, attend a fundraising concert and reception at Goldsmiths Hall in aid of The Royal Opera House on March 9, 1981 in London, United Kingdom. (Photo by Anwar Hussein/Getty Images)

LONDON, ENGLAND - MARCH 09: Prince Charles, Prince of Wales and his fiance, Lady Diana Spencer, wearing a strapless black taffeta dress designed by David and Elizabeth Emanuel, attend a fundraising concert and reception at Goldsmiths Hall in aid of The Royal Opera House on March 9, 1981 in London, United Kingdom. (Photo by Anwar Hussein/Getty Images)