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Video: Kristen Stewart Amused By Robert Pattinson's Lie Detector Joke

Rumors swirled last week when Twilight star Kristen Stewart was spotted in a car with a man who looked like Rupert Sanders, the British director she smooched. Kristen’s beau Robert Pattinson decided to have a little fun with the situation, see who the mystery man really is, and the absurd lie detector test.