Ryan Bingham, Nicole Polizzi, Nicole Snooki Polizzi, Margaret Cho, Mike The Situation Sorrentino, Kitaro with Jane Chang, The Black Keys, Patrick Carney, Dan Auerbach, Jimmie Vaughan with guest, Barry Manilow (+), Kelly Osbourne, Lady Gaga (in an egg), Mumford and Sons, Ben Lovett, Winston Marshall, Marcus Mumford, Ted Dwane, Monica (singer), Martina McBride, Faith Evans, Ciara (singer), Nadeea, Ray LaMontagne, Dollphace, Jenna Ushkowitz, Crystal Bowersox, Florence Welch, Tank (singer) and guest, Anna Nalick, Patrick Warburton with guest, Desmond Child, Ariana Grande and Frankie Grande, Adam Levine, Nicki Minaj (+), Frida Giannini, Lenny Kravitz, Mayra Veronica, John Mayer, The Smeezingtons, Philip Lawrence, Bruno Mars, Ari Levine, Tia Carrere, Paz Vega, Janelle Monae, Yolanda Adams, Jennifer Hudson, Nikki Sixx with guest, Bobby Ray Simmons Jr of BOB with mom, Natasha Bedingfield, Brad Arnold with wife Jennifer Sanderford, Charmine, Eva LaRue, Jewel (singer) with Ty Murray, Mya (singer) with DJ Cedric Gervais, Julianne Hough, Nancy ODell (brief), Eva Longoria, Kevin McHale, Jeremy Davis, Hayley Williams, Taylor York, Jared Followill, Caleb Followill, Nathan Followill of Kings of Leon, Matthew Morrison, Naya Rivera, Darren Criss, Dave Haywood, Hillary Scott, Charles Kelley of Lady Antebellum, The Ramones, Kathy Griffin, Gretchen Wilson, Barry Manilow with Lorna Luft, Sasha, Paul Katz, LL Cool J with wife, Pauley Perrette, Drake (rapper) with guests, Samantha Mara, Christopher Wolstenholme, Matt Bellamy, Dominic Howard of Muse, Amber Riley, Dianna Agron, Ricky Martin, Lil Wayne, Nicki Minaj, Tyga, Tyrese Gibson, Willow Smith (+), Jada Pinkett Smith, Will Smith, Selena Gomez, _____100, Donnie Wahlberg, Scott Underwood, Pat Monahan, Jimmy Stafford of Train (band), ____104, Toni Braxton, Chord Overstreet, Neil Young, Dierks Bentley with wife Cassidy Black, Mark Salling, Nicole Kidman, Keith Urban, Neil Patrick Harris, Manda Mosher, David Foster with Yolanda Foster, Fally, Esperanza Spalding, John Legend (+) with Chrissy Teigen, Lea Michele (brief), Neil Portnow, Kim Kardashian, Rob Kardashian, Sean Diddy Combs, Jordin Sparks, India Arie, Justin Bieber, Cyndi Lauper with guest, Eddie Cibrian (+), Leann Rimes (+), Adam Lambert, Heidi Klum, Seal (singer), Keri Hilson, Jesse Williams, Rihanna, Bar Refaeli with guest, Sara Bareilles, Rodney Jerkins, Usher Raymond, Marc Anthony, Jennifer Lopez, Miley Cyrus, Russell Brand (+), Jamie Foxx with guests, Katy Perry, Ann Pearl Hudson, Bleona Qereti
