Nick Carter has admitted it: he cheated on Paris Hilton with Ashlee Simpson... a long time ago.
It's old news, but we know it's true: Brad Pitt did cheat on Jennifer Aniston with Angelina Jolie.
David Boreanaz slept with Rachel Uchitel while married. Yes, he has something in common with Tiger Woods.
Hank Baskett is accused of stepping out on Kendra Wilkinson. With a transgender model. While his wife was pregnant.
Once considered a top-tier candidate for U.S. President, former Senator John Edwards saw his career unravel after an affair, and love child, with Rielle Hunter.
Wait! There's more Celebrities Who Are Known Cheaters! Just click "Next" below: