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SANDRINGHAM, UNITED KINGDOM - DECEMBER 25: Princess Diana At Sandringham On Christmas Day. The Princess Is Wearing A Red Coat And A Broad-brimmed Black Hat. She Is Carrying A Bouquet Of Flowers. (Photo by Tim Graham Picture Library/Getty Images)

SANDRINGHAM, UNITED KINGDOM - DECEMBER 25:  Princess Diana At Sandringham On Christmas Day.  The Princess Is Wearing A Red Coat And A Broad-brimmed Black Hat.  She Is Carrying A Bouquet Of Flowers.  (Photo by Tim Graham Picture Library/Getty Images)

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Princess Diana (1961 - 1997) and her son Prince William on their way to a Christmas Day service at Sandringham Church, 25th December 1993. (Photo by Princess Diana Archive/Getty Images)

Princess Diana (1961 - 1997) and her son Prince William on their way to a Christmas Day service at Sandringham Church, 25th December 1993. (Photo by Princess Diana Archive/Getty Images)