Couple Nickname: None
Dated Between: 2009 - Present

Another instance of double infidelity was the affair that took place between LeAnn Rimes and Eddie Cibrian when they met on the set of a Lifetime movie they were starring in together. The two carried on their affair even after being caught by paparazzi, and were even reported to have rented a house in West Hollywood to escape to for late night hook-ups.

It's sort of impressive when a Lifetime movie isn't the worst thing that a couple does together, isn't it? The two eventually left their respective spouses and married each other in April 2011, but there have been reports that Rimes is nervous about Cibrian's faithfulness to her. Well, you know what they say: Once a cheater, always a cheater.