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UNITED KINGDOM - AUGUST 04: Diana, Princess of Wales (1961 -1997) during the Queen Mother's 87th birthday celebrations on August 4, 1987. (Photo by Georges De Keerle/Getty Images)

UNITED KINGDOM - AUGUST 04:  Diana, Princess of Wales (1961 -1997) during the Queen Mother's 87th birthday celebrations on August 4, 1987.  (Photo by Georges De Keerle/Getty Images)

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HONG KONG - NOVEMBER 10: (NOT FOR MAGAZINE COVER USE IN GERMANY BETWEEN 15 August and 31 August 2007) Princess Of Wales In Hong Kong Wearing A Pearl And Diamond Tiara Which Was A Wedding Gift From The Queen. (Photo by Tim Graham/Getty Images)

HONG KONG - NOVEMBER 10:  (NOT FOR MAGAZINE COVER USE IN GERMANY BETWEEN 15 August and 31 August 2007) Princess Of Wales In Hong Kong Wearing A Pearl And Diamond Tiara Which Was A Wedding Gift From The Queen.  (Photo by Tim Graham/Getty Images)

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Lady Diana Spencer visits Broadlands shortly after her engagement to the Prince of Wales, March 1981. (Photo by Kypros/Getty Images)

Lady Diana Spencer visits Broadlands shortly after her engagement to the Prince of Wales, March 1981. (Photo by Kypros/Getty Images)

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SANDHURST, UNITED KINGDOM - APRIL 10: Princess Diana (1961 - 1997) attends a passing out parade at Sandhurst, on April 10, 1987, she is wearing a military style suit by Catherine Walker and hat by Graham Smith at Kangol (Photo by Georges De Keerle/Getty Images)

SANDHURST, UNITED KINGDOM - APRIL 10:  Princess Diana (1961 - 1997) attends a passing out parade at Sandhurst, on April 10, 1987, she is wearing a military style suit by Catherine Walker and hat by Graham Smith at Kangol  (Photo by Georges De Keerle/Getty Images)

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ENGLAND - JULY: Diana, Princess of Wales at a polo match before she married in July 1981 in Tidworth, England. Diana was upset by overzealous attention of the press photographers. (Photo by Anwar Hussein/WireImage)

ENGLAND - JULY:  Diana, Princess of Wales at a polo match before she married in July 1981 in Tidworth, England.   Diana was upset by overzealous attention of the press photographers.  (Photo by Anwar Hussein/WireImage)