We recently saw Justin Bieber puke on stage. Not one to be outdone, Lady Gaga joined in on the hot new trend and threw up all over the stage in Barcelona. Unlike Bieber, Gaga works the puking in to her dance, sparking what is sure to be the coolest new move at all the tween parties. Who will be the next pop star to get in on this beautiful act of performance art? Do you think other bodily functions will be next? Is Gaga the GG Allin of pop music?