A photographer has alleged that Kensington Palace suppressed a photo of Princess Diana with David Bowie because it was taken following a concert she attended with Army Major James Hewitt during their affair.

In a May 10 interview with The Telegraph, music photographer Denis O’Regan shared the story behind the image, which he said was captured after one of Bowie’s Glass Spider Tour shows at Wembley Stadium in June 1987. The published photo shows Princess Diana and Bowie smiling in casual clothes, with a “Dressing Room” sign behind them. Diana appears visibly starstruck.

O’Regan recalled that Diana, then 25, had sweetly asked him if Bowie might be willing to pose for a picture with her. However, according to him, palace officials intervened due to growing speculation about Diana’s relationship with Hewitt, with whom she was romantically involved from roughly 1986 to 1991.

“The next day, my agent got a call from the palace, saying don’t use the pictures because word had gone out about James Hewitt,” O’Regan told The Telegraph. “So that’s when it kind of erupted. It was interesting, on a number of levels.”

The revelation came as O’Regan discussed his upcoming book, David Bowie by Denis O’Regan, set for U.S. release on August 5. The collection, showcasing images from over 200 of Bowie’s concerts, includes the previously unreleased photograph with Diana. O’Regan said she had attended that particular show alongside Hewitt.

“They just didn’t want Diana in the press,” he said, explaining the palace’s stance. “They didn’t want to fuel the fire.”