Eddie Cibrian is preparing to sue a U.S. magazine over claims he is cheating on new girlfriend Leann Rimes with a former lover.

Aspiring actress Scheana Marie Jancan recently told Life & Style magazine that the American TV star is a serial cheat who will sleep with women behind Rimes' back, as he did to his ex-wife Brandi Glanville.

Jancan warned Rimes, who quit her own marriage to date Cibrian, that the hunk will dump her after he has had his fun.

And the same publication, Life & Style, went on to claim Jancan was once again in Cibrian's bed - behind Rimes' back.

But the actor is fuming over the allegations, and is getting a case ready to file a libel lawsuit against editors of the glossy mag.

A statement from the star's rep says, "Unfortunately Life & Style Magazine has chosen to go out with a story filled with inaccuracies and deceitful lies, presumably to titillate sales, but clearly resulting in harm to Eddie Cibrian and others.

"This is irresponsible and reckless journalism. Eddie has met with his attorneys and will be filing a suit for libel and other actionable grounds shortly.

"It's a shame that Life & Style resorted to a story of this nature and they will regretfully now have to face scrutiny of untruthful reporting in a court proceeding."