Wiz Khalifa and Adam Levine at Wango Tango 2012

Wiz Khalifa (L) and Adam Levine of Maroon 5 treated the audience to a live version of their song 'Payphone'.

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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