Did Kristen cheat on Rob?

Ever since pics came out of Kristen cozying up to her Snow White and the Huntsman director, rumors have been flying about what's really going on with Robsten. Unfortch, Kristen has admitted to cheating, but regrets it a lot. "Rob is the person I love and respect the most," she says. "I'm so sorry." Hopefully, Rob can find it in his heart to forgive!