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WINDSOR, UNITED KINGDOM - JUNE 06: Princess Diana At Polo, Just Two Weeks Before The Birth Of Her First Child, Prince William. Wearing A Maternity Dress Designed By Fashion Designer Catherine Walker She Is Walking With Sarah Ferguson. (Photo by Tim Graham Photo Library via Getty Images)

WINDSOR, UNITED KINGDOM - JUNE 06:  Princess Diana At Polo, Just Two Weeks Before The Birth Of Her First Child, Prince William. Wearing A Maternity Dress Designed By Fashion Designer Catherine Walker She Is Walking With Sarah Ferguson.  (Photo by Tim Graham Photo Library via Getty Images)