Back Off, John Travolta
This moment on the red carpet between John Travolta and Scarlett Johnsson is pretty cringe-worthy. He went in for a kiss on the cheek, but the encounter turned weird really fast when his hand ended up on her waist and she looked visibly uncomfortable. She laughed it off, but he looks like he realizes exactly what he's done, and wishes he hadn't.
When Kristen Stewart Slept With Her Director
Kristen Stewart messed up big time when she cheated on the most desirable man in Hollywood, Robert Pattinson, with her slimy director, Rupert Sanders. They were working on Snow White and the Huntsman together, and the lines got blurry really fast. That swiftly ended the Twilight stars' romance.