LeAnn Rimes

According to US magazine LeAnn Rimes is having a shocking affair with her TV movie costar, Eddie Cibrian.

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?

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 says: “We do not comment on our clients’ personal lives.”

Cibrian’s manager didn’t respond for a request for comment.