In her first face-off after taking the Pop Clash title from Britney Spears, Lady Gaga proved she's a force to be reckoned with! Mother Monster went head-to-head with rising star Lorde, and her R. Kelly collabo took 90 percent of the votes! This week, 'Do What U Want' is up against Christina Perri's 'Human.' Which song should win? It's up to you to decide!