Queen Camilla was allegedly assaulted as a teenager and fought off her attacker with a high heel.

Former royal correspondent Valentine Low recounted how the royal once shared the traumatic event with former UK Prime Minister Boris Johnson in his forthcoming book, “Power and the Palace: The Inside Story of the Monarchy.”

In an excerpt obtained by the Sunday Times, the author wrote that Johnson and his ex-communications director, Guto Harri, were invited to tea with Camilla and King Charles at Clarence House in June 2008 when the politician was the mayor of London.

Recalling Johnson and Camilla’s interaction, Harri told Low, “They obviously got on like a house on fire.

“He was making guttural noises about how much he admired and liked her. But the serious conversation they had was about her being the victim of an attempted sexual assault when she was a schoolgirl.”

Harri claimed that Camilla, now 78, told Johnson that the incident occurred on a train to Paddington when she was around 16 or 17 years old.

“Some guy was moving his hand further and further,” Harri alleged, explaining that Johnson was intrigued, asking Camilla how she reacted.

“I did what my mother taught me to. I took off my shoe and whacked him in the nuts with the heel,” she allegedly told Johnson, per Harri.

Reflecting on the story, Harri claimed that Camilla was “self-possessed enough” to “jump off the train” and “find a guy in uniform and say, ‘That man just attacked me.’”

“He was arrested,” Harri said.

The story allegedly motivated Johnson to open three rape crisis centers in London.

“Nobody asked why the interest, why the commitment,” Harri added.” But that’s what it went back to.”

An insider told the Daily Mail that Camilla — who married Charles in 2005 — is open about the alleged assault to those closest to her because she believes it’s a “positive outcome” if “her own experience helps other women.”

Per the source, Camilla has refrained from opening up about the alleged incident not because of “shame” but because “it simply happened a very long time ago” and she has “always taken the view that other women’s stories are much more important than her own.”

Reps for Camilla and Johnson weren’t immediately available to Page Six for comment.