Eddie Cibrian and LeAnn Rimes
Though they were both married at the time, Cibrian and Rimes began an affair on the set of Lifetime's Northern Lights in 2009. Once their divorces were finalized, the two married in April 2011. "I understand why people are disappointed in me," Rimes once told Shape. "I think any relationship is hard to get out of, and I don't think the way I did it was right."