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SYDNEY- MARCH 28: Prince Charles, Prince of Wales and Princess Diana, Princess of Wales dance together at a charity ball during their tour of Australia on March 28, 1983 in Sydney, Australia (Photo by David Levenson/Getty Images)

SYDNEY- MARCH 28: Prince Charles, Prince of Wales and Princess Diana, Princess of Wales dance together at a charity ball during their tour of Australia on March 28, 1983 in Sydney, Australia (Photo by David Levenson/Getty Images)

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Diana, Princess of Wales (1961 - 1997) and Prince Charles attend a gala dinner and dance at the Wentworth Hotel in Sydney, Australia, March 1983. Diana is wearing a blue gown by Bruce Oldfield. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)

Diana, Princess of Wales  (1961 - 1997) and Prince Charles attend a gala dinner and dance at the Wentworth Hotel in Sydney, Australia, March 1983. Diana is wearing a blue gown by Bruce Oldfield. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)

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SYDNEY, AUSTRALIA - MARCH 28: Prince Charles, Prince of Wales and Diana, Princess of Wales, wearing a pale blue dress with a silver waist belt designed by Bruce Oldfield, attend a Gala dinner and dance at the Wentworth Hotel on March 28, 1983 in Sydney, Australia. (Photo by Anwar Hussein/Getty Images)

SYDNEY, AUSTRALIA - MARCH 28: Prince Charles, Prince of Wales and Diana, Princess of Wales, wearing a pale blue dress with a silver waist belt designed by Bruce Oldfield, attend a Gala dinner and dance at the Wentworth Hotel on March 28, 1983 in Sydney, Australia. (Photo by Anwar Hussein/Getty Images)