Being faithful is hard for everyone, much less celebrities, who live in a world of sexual abundance most of us will never come even close to appreciating. The women on this list all made headlines by participating in high-profile infidelity.
Spelling was married to playwright Charlie Shanian when she met Dean McDermott on the set of the 2005 Lifetime movie Mind Over Murder. McDermott was also married, to Mary Jo Eustace, an actress. The two of them allegedly bedded down the very first night they were introduced to one another, and got married soon thereafter. Cut to 2014, and McDermott is cheating on Spelling in Canada. They're still married.