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Seth Rogen
Seth Rogen's gone on the record multiple times concerning his feelings about Justin Bieber, calling him a "piece of sh*t" on Twitter and confimring that sentiment later on Watch What Happens Live. Then he went on Howard Stern's show to say this: "I've met him a few times. He's a good example of someone who you meet who you think you are going to hate and then you get to hate him as much as you [thought]... He's a bit of a dick."