One of the alleged mistresses of Tiger Woods has been accused of cheating on the golf star with none other than George Clooney.

Us Weekly magazine reports Jaimee Grubbs, 24, was with the Hollywood heartthrob actor as recently as two months ago.

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The magazine quoted a source claiming the cocktail waitress and Clooney's relationship was still not exactly a secret among her friends.

It claims Grubbs would show her girlfriends phone messages from a number she said was Clooney's.

"The two had been seen out together in public long before the Tiger Woods scandal went down, but because nobody knew who Jaimee was at the time, nobody really made a note of it," the source told Us Weekly.

"All of her friends knew they were hooking up."

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It comes as Ms Grubbs apologised to Tiger's wife Elin on national television in the United States.

She told NBC's Extra Woods made her "feel like I was the only girl."

"I wouldn't have pursued him if he didn't pursue me," she said.

“When he did, I just figured he was single and I didn't think to ask."

It was also revealed Ms Grubbs had more than 300 text messages she claims are from Tiger.

One of the text messages allegedly sent by Woods read: "I will wear you out ... when was the last time you got (bleeped)?"

Another read: "Send me something very naughty... Go to the bathroom and take (a picture)."

The National Enquirer is also reporting that Woods may have fathered a love child and that one of his mistresses had an abortion.

Tiger's alleged list of mistresses includes porn star Holly Sampson, 36, and 33-year-old restaurant worker Mindy Lawton, who claimed she met Woods every couple of weeks in 2007 for sex.

Rumours of Woods's alleged infidelity started soon after a car crash when the golfing champion refused to speak to police, fuelling speculation that he had been fleeing his wife after she became violently angry at reports he was seeing a New York nightclub hostess.