Best Balloons: Katy Perry
Katy wasn't in attendance, mind you, but her beamed-in performance of "Birthday" still managed to outshine 90 percent of stuff they shoved on the MGM Grand's stage. Currently on the U.K. leg of her Prismatic tour, KP bounded through an ebullient, chock-full-of-everything take on her latest single. She wore what appeared to be a Keith Haring canvas and, at one point invited a star-struck fan onstage for an actual birthday serenade (all we got her was a gift card). Oh, and for the grand finale, she floated across the arena on a bunch of balloons. All Shakira had was some pyro.