Credit: JN/DS/Flynet (2)

LeAnn Rimes has gotten very cozy with Eddie Cibrian and his two young sons.

Earlier this week, the four of them went on their first major family vacation together to Mexico.

Clad in a slinky bikini, Rimes, 27, played in the sand with Cibrian's two boys, Mason, 6, and Jake, 2. (See more photos of LeAnn and Cibrian at

She also squeezed in some PDA time with her man, 36.

At one point, she asked an onlooker to take a photo of her wrapping her legs around Cibrian. Later, they walked hand-in-hand on the beach.

A year ago, broke the news that Rimes and Cibrian had an affair while shooting the 2009 Lifetime movie Northern Lights.

A few months later, Rimes split from her husband of nearly eight years, Dean Sheremet, and Cibrian's wife, model Brandi Glanville, filed for divorce.