Sarah Symonds is turning up the heat on celebrity chef Gordon Ramsay.

Amidst the "Hell's Kitchen" star's denials that he was inolved in an affair with her, the author of "Having An Affair? A Handbook For The Other Woman" says in an interview with the U.K.'s News of the World that “not only has he been cheating on [his wife] Tana with me, but he told me he had another regular mistress in Denmark."

Symonds' allegations come after Ramsay reportedly told the audience at a cooking demonstration attended by his wife and mother: “I didn’t do it! Mum, I love you.”

The News of the World reports that Symonds, 38, said she was upset with Ramsay's hypocrisy in denying the affair.

“But enough is enough,” says 38-year-old Sarah. “He should be on his knees eating humble pie—but instead he’s lying. He needs to refresh his memory and read my diaries.”

The CEO of AshleyMadison.com Noel Biderman told Foxnews.com that, earlier this year, in discussing how Symonds could generate publicity as the face of the company, "one of the ideas we threw around was if she was too have a high-profile affair. At the time, she specifically asked if an affair with a top British chef would accomplish what we needed to do."

Read the full Sarah Symonds interview in The News of the World.