Ke$Ha Katy Perry Lady Gaga Adam Lambert Hot Chelle Rae 3oh!3 Britney Spears Runner Runner Natalia Kills Lmfao Carly Rae Jepsen Owl City Selena Gomez Cobra Starship Christina Aguilera Ariana Grande Keke Palmer Cascada Dev The Wanted Nick Jonas Flo Rida Cassie Weatherstar The Band Perry Call The Cops The Cataracs Paramore Christina Perri Amanda Blank Alexandra Stan *Nsync Bridgit Mendler Carly Rae Metro Station Cash Cash Lil Wayne Karmin Little Boots Sky Ferreira Backstreet Boys T. Mills Young And Divine Havana Brown Relient K Joe Jonas Rita Ora Victoria Justice Down With Webster