Princess Diana and David Bowie at the Concert of Hope benefit for World AIDS Day at Wembley Arena in London on December 2, 1993. | Credit: Tim Graham Photo Library via Getty Images ...

Princess Diana Archive/Getty Princess Diana and David Bowie at Wembley Arena in London for the Concert of Hope on World AIDS Day on Dec. 2, 1993.

Never before seen pictures of Princess Diana and David Bowie have been discovered 40 years after they were taken. The images were 'buried' after photographer Denis O'Regan received a 'polite ...

Princess Diana Archive/Getty Princess Diana and David Bowie at Wembley Arena in London for the Concert of Hope on World AIDS Day on Dec. 2, 1993. Can't get enough of PEOPLE's Royals coverage?