LeAnn Rimes secret affair with 'Northern Lights' ' Eddie Cibrian?

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LeAnn Rimes just got way more interesting.

Eddiecibr_alber_7777605_600 Just a few weeks after a photo of LeAnn with her sexy, shirtless husband of seven years, Dean Sheremet,  appeared in several tabloids, comes news that she's having an affair!

And a steamy one at that -- with her costar in the upcoming Lifetime movie "Northern Lights."

Say it isn't so!

Us Weekly says the dude is the actor Eddie Cibrian, who has two children with Brandi Glanville, and who also appeared in "Ugly Betty," "Invasion" and "Samantha Who?"

Leannrimes"From the moment we rehearsed, LeAnn and Eddie honestly developed a really strong bond and a warm relationship," "Lights" director Mike Robe blabbed before this news leaked out.

Apparently, that warmth burned off the set as well.

The new Us Weekly has video security camera photos of the two stars holding hands and kissing in Laguna Beach, Calif

Us Weekly also reports that the new couple met for a three-hour tryst at the Malibu Beach Inn on March 14.

OK, if you had a TV movie starring a boring country singer star and a still unknown hunky actor, how would you build the buzz?

Ta-da! Are you thinking what we're thinking?

Photo: LeAnn and husband Dean Sheremet. Eddie Cibrian and mother of his two kids, Brandi Glanville. Credit: WireImage