SIMON Cowell yesterday sensationally confessed to having a three-in-a-bed session with two mystery beauties.

The X Factor chief, 51, revealed in his raunchiest-ever interview how he found himself alone with the two gorgeous girls.

He said of the encounter, which he confessed happened "years ago": "I was just with these two girls and we ended up in bed. It was cool - I liked it."

Cowell also admitted sharing a blind date with Charlie Sheen`s ex Denise Richards, 40, when she was eight months pregnant - and said he romped with other celebs, who he would not name.

And asked whether he is still engaged to make-up artist Mezhgan Hussainy, 37, he replied: "I`m not sure."

Pressed on the remark during a US radio interview, he added: "It`s something I would need to say to you off the radio.

"I do get embarrassed talking about these things publicly."

The millionaire telly mogul was quizzed about his sex life on controversial shock jock Howard Stern`s breakfast show.

Asked if he had enjoyed showbiz conquests, Cowell said: "I have. I can`t tell you who." Then, getting the mum of three`s name wrong, he added: "I did have a bizarre blind date with Denise Lewis, Charlie Sheen`s ex."

After he was corrected on her name, he added: "She`s cute. We met in a hotel and she turned up eight months pregnant with a dog in her handbag. She`s a bit of a whacko - but I like that."

Stern also asked if Cowell had been to bed with MORE than two women at once.

But Cowell replied: "If it`s a threesome that`s all you can go up to. You mean like a fivesome? That`s an orgy."

The talent show judge, speaking from his bed in London, was also questioned on his birth control methods and appeared to suggest he did not use condoms.

But he denied that meant his previous partners had had abortions, telling Stern: "There are other methods you can use."

Cowell, promoting this month`s launch of The X Factor in the US, called singer Nicole Scherzinger - a judge on the Stateside show - "one of the most beautiful women I have ever seen".

He also confessed he still loves his ex Terri Seymour. But he said: "We were together six years. You just get to the point when it`s better if you don`t go out with each other any more."

A spokeswoman for Cowell said last night of his reaction to being quizzed about Mezhgan: "Simon was just making it clear that he doesn`t discuss his relationships."