Justin Bieber at Wango Tango 2012

From dropping daks to baring boobs, check out the celebrity antics at Wango Tango 2012.

My oh my Justin Bieber! Didn't your mother teach you to wear a belt? The Biebs had an onstage wardrobe malfunction in the form of flashing his undies at Wango Tango 2012 while introducing his protege, fellow Canadian pop star Carly Rae Jepsen. Lucky his mother taught him to wear clean underwear!

Photo by Getty Images May 14, 2012

PHOTOS: WANGO TANGO 2012

Justin Bieber flashes his undies while Perez Hilton flashes his chest. Check out the star antics at KIIS FM's annual concert event, Wango Tango.

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