Kristen Stewart Cheated On Robert Pattinson

Kristen Stewart cheated on Robert Pattinson!?

US Weekly reports that Kristen cheated on Rob with Snow White And The Huntsman director, Rupert Sanders. Apparently, Kristen, 22, and Rupert, 41, were photographed together in a way that prove that they had an affair behind Rob's back and Rupert's wife,  Liberty Ross. A source said that it was one time thing and a complete lapse of judgement on Kristen's part. 

Readers, what do you think of Kristen Stewart allegedly cheating on Robert Pattinson? (Getty)