Eddie Cibrian: Busted By Celebrity Gossip!

Before she picked up a celebrity gossip magazine and read all about it, Eddie Cibrian's affair with LeAnn Rimes would have been news to Brandi Glanville.

Cibrian's wife says she found out he was cheating on her through the media, according to new documents filed in their divorce case, which is underway.

Glanville, a model whose legal name is Brandi Cibrian, "first learned of his infidelity in March 2009" and never names the other woman in her filing.

It just so happens that Us posted a video of Eddie making out with LeAnn Rimes at a restaurant that same month, so there is little doubt who it is.

Eddie and Brandi Cibrian in happier times.

Brandi claims Eddie, with whom she has two young sons, Mason and Jake, said he promised to stop cheating and that they even sought marital counseling.

But, by July, she found out the affair with LeAnn Rimes was still in full blossom ... again courtesy of celeb gossip media. Not being too discreet there, Ed.

Brandi also claims Eddie was unfaithful to her with at least one other woman during their marriage. That would be Scheana Marine Jancan, we believe.

Eddie and LeAnn are still together now, but keeping things on the DL.

The moral of the story: If you thought celebrity gossip never contributed to anything of value ... you're right. But he was bound to get caught sometime.