Richard Gere and Sylvester Stallone once battled over Princess Diana at a dinner party hosted by Elton John — after Stallone’s plans to romance the royal were derailed by Gere, the singer dishes in his new memoir.

“Straight away, Richard Gere and Diana seemed very taken with each other,” John writes in the autobiography, “Me,” according to an excerpt obtained by the Daily Mail. “She was separated from Charles by this point, and Richard had broken up with Cindy Crawford. They ended up sitting in front of the fireplace together, locked in rapt conversation.”

Stallone seemed to eye the pair jealously, according to John, who hosted the dinner party with his now-husband, David Furnish, for Disney chief Jeffrey Katzenberg at their UK home. John was writing songs for “The Lion King” at the time, and Katzenberg specifically requested the princess’ presence at the party.

As the dinner guests moved into the dining room, Stallone and Gere were nowhere to be found, John writes. Furnish discovered them squaring off in the corridor “apparently about to settle their differences over Diana by having a fist-fight,” the excerpt reads.

After dinner, Diana and Gere resumed their flirting, prompting Stallone to storm out.

“‘I never would have come,’ he snapped, as David and I showed him to the door, ‘if I’d known Prince f—in’ Charming was gonna be here.’ Then he added: ‘If I’d wanted her, I would’ve taken her!'” John writes.

Diana, meanwhile, was “completely unruffled” by the dispute.

“Maybe she hadn’t realised [sic] what was happening. Or maybe stuff like that happened all the time and she was used to it,” John writes.

The memoir, in which John promises “no-holds-barred” revelations, is slated for an Oct. 15 release.