Kristen Stewart's admission of infidelity shocked the world this week, but it certainly wasn't the first time an A-list celeb was caught stepping out on their significant other.
Jesse James' affair with stripper Michelle "Bombshell" McGee was the focus of months of tabloid attention in 2010 after it was discovered the American Chopper star had been cheating on America's sweetheart Sandra Bullock for months. The news broke shortly after Bullock had won her first Academy Award for The Blindside and right before she would make her adoption of son, Louis, public.
Jude Law saw his engagement to Sienna Miller crash and burn after his affair with his children's nanny was discovered in 2005. Law released a public apology to Miller, admitting to sleeping with caretaker Daisy Wright, to no avail. A little more than a year later, the two reconciled but ultimately went their separate ways.
Kelsey Grammer and ex-wife Camille were married thirteen years when she discovered he wanted out of the relationship in 2010. Just fifteen days after his divorce was finalized, Kelsey married 29-year-old flight attendant Kayte Walsh. Grammer has since admitted to the infidelity, which took place just six months before he and Camille would file for divorce.
The biggest scandal of all comes from actor and former California governor Arnold Schwarzenegger. Not only did he cheat on his wife of 25 years in early 2011, Maria Shriver, with the housekeeper, but he also fathered a child out of wedlock. Schwarzeneger delivered a public apology shortly after, and the former couple is currently undergoing a divorce.