Justin Bieber Loses it Onstage

8/24/2015 7:07 AM PDT

Justin Bieber Loses it Onstage (PHOTOS)

Justin Bieber's performance at Sunday night's Billboard Hot 100 Music Festival seemed a little like a male revue show ... as he stripped down slowly, but surely, during his performance. 

People were screaming "Encore!" for a whole different reason.