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Justin Bieber is trying to prove that he is all grown up. The singer has released a promotional video for his new movie Believe, where the pop star is seen trying to prove that he is mature. In the video, Justin is seen joking around with his manager Scooter Braun saying that now that he drinks a lot of coffee he is a grown man. And if his coffee habit isn't a sign of maturity, Justin shows off his new mustache. The video also features Justin's Mom, Pattie Mallette and Usher commenting about how things have changed as Justin has gotten older.