Justin Bieber, Diddy-Dirty Money, Jason Derulo, Travie McCoy and Bruno Mars perform at the 12th annual gala honoring achievement in entertainment, sports and fashion. Katy Perry and male "Glee" cast members host. Scheduled to appear: Robert Pattinson, Ellen Degeneres, Chace Crawford, Taylor Swift, Jimmy Fallon, Selena Gomez, Betty White, Leighton Meester, David Archuleta, Kristen Bell, John Cena, Miranda Cosgrove, Zac Efron, Khloe, Kim and Kourtney Kardashian, Jim Parsons and Shailene Woodley.