Justin Bieber Stages Street Sing-along

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June 28, 2012 | 7:31am EST

Teen heartthrob Justin Bieber thrilled a crowd of fans by staging an impromptu street performance in California on Wednesday.
An excited throng of girls waiting outside a Burbank TV studio was sent into a frenzy when Bieber pulled up alongside them in a black van after taping an appearance on The Tonight Show With Jay Leno.
Bieber tried to calm the screaming youngsters by engaging in some small talk, but they went wild when he decided to perform his hit single Boyfriend for them.
Accompanied by a guitarist, the pop star attempted to serenade his fans, but his voice was completely drowned out as the crowd sang along.