LeAnn Rimes and husband Dean Sheremet, wearing flip flops, leaving a medical building in Bevelry Hills, Los Angeles, California - 19.02.09

The Blue hitmaker, who has been married to back-up dancer Dean Sheremet for seven years, is reportedly having an affair with her her TV movie Northern Lights co-star Eddie Cibrian, according to UsWeekly.

The publication claims that shocking security camera footage caught the clean-cut country star kissing the actor on an intimate date at Mosun and Club M in Laguna Beach, California earlier this month (Mar09).

And it seems the pair hit it off immediately on-set - their Northern Lights director Mike Robe had previously told UsWeekly.com, "From the moment we rehearsed, LeAnn and Eddie honestly developed a really strong bond and a warm relationship."

The singer renewed her wedding vows to Sheremet last August (08).

Cibrian has been married to model Brandi Glanville since 2001, and has two young sons.

A representative for Rimes tells the publication, "We do not comment on our clients' personal lives."

Source: WENN