British Royalty. Smiths Lawn, Windsor, England. June 6th, 1982. Princess Diana watching the Polo while pregnant with Prince William. [Getty Images]

British Royalty, Smiths Lawn, Windsor, England, June 6th, 1982, Princess Diana watching the Polo while pregnant with Prince William (Photo by Bob Thomas/Popperfoto via Getty Images/Getty Images)

Popperfoto Bob Thomas/Popperfoto