To perform new singles, Psy brought an army of hip-shaking back-up dancers for "Gentleman" (above) while Jennifer Lopez and Pitbull presented a circus-inspired production for collab "Live It Up"—for which fellow diva Mariah Carey definitely did not even clap for. (C'mon Mimi.)
Jennifer Lopez and Pitbull, "Live It Up"
Jessie J and runner-up Angie Miller, "Domino"
Adam Lambert and runner-up Angie Miller, "Titanium"
Emeli Sande and fourth-place finisher Amber Holcomb, "Next to Me"
The Band Perry and fifth-place finisher Janelle Arthur, "Done"