Biggest Celebrity Infidelity Scandals

Ashton Kutcher and Demi Moore (Reuters)

Oh no he didn't!

According to Star magazine, Ashton Kutcher has cheated on his 15-years-older wife, Demi Moore, for the second time, enjoying a steamy romp on the sofa with a 21-year-old woman. The tabloid says the actor also previously indulged in a "public make-out session with a young blonde."

Kutcher, 32, took to Twitter (as usual) to furiously deny the report.

"I think Star magazine calling me a 'cheater' qualifies as defamation of character. I hope my lawyer agrees," he tweeted, adding: "STAR magazine -- you don't get to stand behind 'freedom of the press' when you are writing fiction."

SODAHEAD SLIDESHOW: See celebrities caught in cheating scandals.

His lawyer, Marty Singer, then released the following statement: "Star Magazine continuously publishes lies about Ashton Kutcher and many other celebrities."

But according to Star, Brittney Jones says she spent a "hot night" with the handsome actor after meeting him at a bowling alley -- where he was hanging out with 47-year-old Moore. (Already, this story is starting to sound a little fishy.)

Days later, she says she had sex with Kutcher on a sofa in the house he shares with Moore and her daughters.

"We made love on the couch. He's a great lover, very considerate and sweet," Jones reportedly said.

If the report is true, Kutcher will be far from the firs,t celebrity to have a little fun while the spouse isn't looking. Country singer LeAnn Rimes recently opened up to Shape magazine about cheating on ex-husband Dean Sheremet.

"I understand why people are disappointed in me, especially since I grew up as America's sweetheart. I think any relationship is hard to get out of, and I don't think the way I did it was right," she told the mag. "It wasn't a fulfilling marriage for either of us," she added. "As we got older, we grew apart."

While Rimes was still married, rumors began to swirl that she was dating actor Eddie Cibrian, who was also married. Rimes and Cibrian are now officially a couple and living together.