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TETBURY, UNITED KINGDOM - JULY 18: Princess Diana Carries Prince Henry (harry) On Her Shoulders At Highgrove. (Photo by Tim Graham Photo Library via Getty Images)

TETBURY, UNITED KINGDOM - JULY 18:  Princess Diana Carries Prince Henry (harry) On Her Shoulders At Highgrove.  (Photo by Tim Graham Photo Library via Getty Images)

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WINDSOR, UNITED KINGDOM - JUNE 29: The Princess Of Wales Presenting Prince Charles With A Trophy After His Victory In A Polo Match (Photo by Tim Graham Photo Library via Getty Images)

WINDSOR, UNITED KINGDOM - JUNE 29:  The Princess Of Wales Presenting Prince Charles With A Trophy After His Victory In A Polo Match  (Photo by Tim Graham Photo Library via Getty Images)

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NEW FOREST, UNITED KINGDOM - MAY 15: Princess Diana Watching Polo In The New Forest. She Is Pregnant With Her First Baby, Prince William. (Photo by Tim Graham Photo Library via Getty Images)

NEW FOREST, UNITED KINGDOM - MAY 15:  Princess Diana Watching Polo In The New Forest. She Is Pregnant With Her First Baby, Prince William.  (Photo by Tim Graham Photo Library via Getty Images)

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Prince William, with his parents Prince Charles and Princess Diana (1961 - 1997), at his first official photo-call in the garden at Kensington Palace, London, 14th December 1983. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)

Prince William, with his parents Prince Charles and Princess Diana (1961 - 1997), at his first official photo-call in the garden at Kensington Palace, London, 14th December 1983. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)

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HUAMBO, ANGOLA - JANUARY 15: Princess Diana In An Area Cleared Of Landmines By The Halo Trust, Huambo, Angola. (Photo by Tim Graham Photo Library via Getty Images)

HUAMBO, ANGOLA - JANUARY 15:  Princess Diana In An Area Cleared Of Landmines By The Halo Trust, Huambo,  Angola.  (Photo by Tim Graham Photo Library via Getty Images)