Bieber-mania: Justin Bieber Does Letterman 03/23/10 [Photos]

There was beatlemania and now there is Biebermania.  Canadian teen sensation Justin Bierber causes a huge commotion no matter where he goes.  He appeared on Letterman yesteday  (03.23.10).  Justin took time to sign autographs for the waiting fans.  Photos: Fame Pictures

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