Married LeAnn Rimes Having Steamy Affair With Sexy Costar

Celebrity News Mar. 17, 2009 AT 11:17AM

LeAnn Rimes is having a shocking affair with her TV movie costar, Eddie Cibrian, Us Weekly reveals in its newest issue, on stands Wednesday.

Rimes, 26 -- currently wed to former backup dancer Dean Sheremet -- got cozy with Cibrian, 35, on the set of her March 21 Lifetime flick, Northern Lights.

Cibrian was recently seen in Ugly Betty, Invasion and Samantha Who?

See photos of stars caught cheating

"From the moment we rehearsed, LeAnn and Eddie honestly developed a really strong bond and a warm relationship," director Mike Robe told Us prior to news of the affair.

Their rapport carried off the set as well. The new Us Weekly features pictures taken from a video security camera that show the two holding hands and kissing on a romantic dinner date at Mosun and Club M in Laguna Beach, California on March 7. (Watch video clip above.)

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

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Rimes married Sheremet seven years ago -- when she was just 19 and he was 21. Cibrian tied the knot with model Brandi Glanville in 2001; they have two sons, ages 5 and 23 months.

A rep for Rimes tells Us: "We do not comment on our clients' personal lives." Cibrian's manager didn't respond for a request for comment.

Look back on the ugliest Hollywood splits.

For more details on Rimes' shocking affair with her costar, the steps she took to save her marriage to Sheremet and why she strayed, pick up the newest issue of Us Weekly.

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