With all the temptations in Hollywood, it's not unusual for someone in a committed relationship to stray. In fact, these days it seems quite common for stars to cheat.

Sometimes actors begin their affairs while on the film set far from home. Other times they're marriages are failing, and they find new partners to make them happy.

Whatever the reason, people cheat. And if you happen to be famous, the world often hears about it.

Sandra Bullock took a chance when she married Jesse James. His first wife was a porn star, after all. Sandra and Jesse wed in 2005 and James' infidelity was exposed in 2011, just days after Bullock won an Oscar for her role in The Blind Side. Talk about being blindsided.

Sandra and Jesse were also in the process of adopting a son when she discovered he had slept with heavily tattooed Michelle "Bombshell" McGee. However, Sandra handled the affair with grace and hasn't looked back since. Jesse later got engaged to tattoo artist Kat Von D and reportedly cheated on her too.

Check out other cheating stars...