Justin Bieber
12:33 pm, June 28th, 2012
VIDEO 
(YouTube)
He performed on "The Tonight Show with Jay Leno" on Wednesday, but Justin Bieber also treated fans to a "Boyfriend" sing-along on the street outside the studio.
VIDEO BELOW
The Biebs pulled alongside the waiting Beliebers in an open van (much less creepy than it sounds), and, accompanied by a guitarist and a sea of cell phone cameras, led a group rendition of his new hit song.
Not surprisingly, everyone seemed to know every word.
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