Emblem3, Keaton Stromberg, Wesley Stromberg, Drew Chadwick, Krewella, Jahan Yousaf, Yasmine Yousaf, Kris Trindl, Kendall Jenner, Kylie Jenner, Britney Spears, Avril Lavigne (+), Emeli Sande, Chris Harrison with kids, Mario Lopez, Bridgit Mendler, Jason Derulo (+), Wilmer Valderrama, Peta Murgatroyd, Chris Colfer, Roshon Fegan, Icona Pop, Caroline Hjelt, Aino Jawo, Cheryl Burke, Labrinth, Katie Cassidy, Janel Parrish, Colton Haynes, Tyler Posey with Seana Gorlick, Miguel (singer), Shahs of Sunset cast, Reza Farahan, Mercedes MJ Javid, Golnesa GG Gharachedaghi, Mike Shouhed, Asa Soltan Rahmati, Fall Out Boy, Patrick Stump, Andy Hurley, Joe Trohman, Pete Wentz, James Maslow with Carlos Pena, Stephanie Pratt, Jason Kennedy, Robert Buckley, Afrojack, Ariana Grande, Megan Nicole, Demi Lovato, Ellen K (radio personality), Ryan Seacrest, Jordin Sparks (brief), Joe Jonas, Jacoby Jones, Karina Smirnoff, Madison Justice (+), Maroon 5, Matt Flynn, PJ Morton, James Valentine, Adam Levine, Mickey Madden, Chuey, Victoria Justice (+), Flo rida, Will i am,
