Eddie Cibrian's Ex: We Both "Know the Truth" About Affair

Credit: Steven Lawton/FilmMagic; Jordan Strauss/WireImage.com

The love triangle has come full circle.

When Us Weekly recently asked Brandi Glanville, 37, about reports that she hooked up with estranged husband Eddie Cibrian, 37, after he'd already left her for LeAnn Rimes, 28, she coyly replied, "Eddie and I both know the truth."

A source confirms in the new Us Weekly that the two spouses, who filed for divorce in August 2009, were indeed intimate last fall.

"Leann stole her husband, so Brandi doesn't owe her," the source says.

"And Brandi couldn't care less. She's already moved on to another relationship." Indeed, Glanville told Us she's dating an "amazing man."