Zachary Levi, Whitney Cummings, BeBe & CeCe Winans with Mary Mary and the West Angeles Choir

Javier Bardem, Jarod Miller, Naturally 7 with the Agape International Choir

Emma Stone, Marjorie Johnson, Sharon Jones & the Dap-Kings

Larry King, Garrett Hedlund, Pink Martini

Owen Wilson, Elle Fanning, Lyle Lovett with Kat Edonson

Jason Segel, Adam Ferrara, Tanner Foust & Rutledge Wood, Katharine McPhee

Emily Blunt, Keith Fitzhugh, Jackie Evancho

Jack Black, Michael Buble

Mark Wahlberg, Olivia Wilde, Good Charlotte

Matthew Morrison, Crystal Bowersox

Halle Berry, Billy Gardell, Natasha Bedingfield

Jeff Bridges, Rico Rodriguez

Helen Mirren, Aaron Eckhart, Keith Urban

Russell Brand, Chris Colfer, Jonny Lang with Chris Layton, Brad Whitford & Billy Cox

Louis C.K., Aron Ralston, Josh Turner

Jane Fonda, Ian Somerhalder, Paul Reiser & Julia Fordham

Mitt Romney, Jay Mohr, Darius Rucker

Chelsea Handler, Kellan Lutz, Rod Stewart

Bill Cosby, Atticus Shaffer, Keyshia Cole

Elizabeth Banks, Marjorie Johnson, Carrot Top

Cher, Jeremy Renner, Robyn

Dwayne Johnson, Kevin Eubanks

Dane Cook, Taylor Swift, Keri Hilson

Garth Brooks, Mike "The Situation" Sorrentino

George W. Bush, Jewel

Christina Aguilera, Buddy Valastro

Julianne Moore, Tom Felton, Nelly

Russell Crowe, Anna Torv, Annie Lennox

Diane Keaton, Kevin McHale, Switchfoot

Kim Kardashian, Dennis Miller, Soulja Boy

David Spade, Christine O'Donnell, Old 97's

Dave Salmoni, Chris Pine, Lee DeWyze

Arnold Schwarzenegger, David Baker, N.E.R.D.

Terry Bradshaw, Jennifer Grey, Jason Aldean

Anne Hathaway, San Francisco Giant Brian Wilson, Aaron Neville

James Franco, Meghan McCain, Far East Movement

Janet Jackson, Jesse Tyler Ferguson, Duffy

Rainn Wilson, Margaret Sparkman, Jimmy Eat World

Denzel Washington, Reed Timmer, Corinne Bailey Rae

Robin Williams, Judd Apatow, Kylie Minogue

Robert Downey Jr., Paula Deen, Jamey Johnson

Matt Lauer, Martha Stewart, Lauren Pritchard

Eva Longoria Parker, Josh Duhamel, John Legend

Wanda Sykes, Rick Fox, Pete Yorn

Harrison Ford, Whitney Cummings, Gogol Bordello

Heidi Klum, Ty Burrell, Johnny Mathis

Jay Mohr, Pauly D, Travie McCoy

Terry Bradshaw, "Potato Lady" Doretta Cannon, OneRepublic

Katherine Heigl, Ben Rappaport, Meat Loaf

Shaun White, Florence Henderson, Toby Keith

Terrence Howard, Jillian Michaels, K.T. Tunstall

Will Arnett, Dot Marie Jones, a performance from Broadway's "Rock of Ages"

Meredith Vieira, Seth MacFarlane, Kenny Chesney

Morgan Freeman, Eric Stonestreet, Rodrigo y Gabriela

Julie Scardina, Diane Lane, Seal

Patrick Dempsey, Mindy Kaling, Train

Lauren Graham, Vanilla Ice, Zac Brown Band

Dwyane Wade, Zachary Levi, Gloria Gaynor

Jimmy Smits, Jackie Evancho, Brian Wilson

Ryan Reynolds, Betty White, Tommy Lee

Ed Helms, Casey Affleck, Sheryl Crow

Justin Timberlake, Jane Lynch, OK Go

Joel McHale, Arianna Huffington, Dov Davidoff

Kate Walsh, Jason Ritter, Santana & India.Arie

Ben Affleck, Julie Bowen, Weezer

Jamie Lee Curtis, Mike "The Situation" Sorrentino, Trace Adkins

Bill Maher, Kristen Bell, Brandon Flowers

Hugh Laurie, Emma Stone, Sarah McLachlan

Katie Couric, Kurt Warner, David Gray

Chelsea Handler, Ken Jeong, Ray LaMontagne

Carey Mulligan, Meghan McCain, Mavis Staples

Louis C.K., Sara Bareilles

Al Michaels, Cris Collinsworth, Steve Buscemi, Herbie Hancock, Susan Tedeschi & Derek Trucks

Thomas Haden Church, Jules Sylvester, Goo Goo Dolls

Kim Kardashian, Rep. Barney Frank, Norah Jones

Don Johnson, Whitney Cummings, Cyndi Lauper & Jonny Lang

Justin Long, Alejandro Escovedo

Javier Bardem, Paul Watson, Peter Bethune, the Whigs

Jason Statham, 92-year-old car lady Rachel Veitch, Los Lobos

Anna Kendrick, Eli Roth, Robert Francis

Howie Mandel, Aubrey Plaza, Mike Posner

Emma Thompson, comics from "Chelsea Lately", Taio Cruz

Mickey Rourke, Seth MacFarlane, Plain White T's

Gordon Ramsay, Sofia Vergara, K'naan

Betty White, Sam Trammell, Black Crowes

Sylvester Stallone, Criss Angel, Maronzio Vance

Gabourey Sidibe, Jakub Vagner, Mike Vecchione

Jennifer Aniston, Jason Schwartzman, Stone Temple Pilots

Eva Mendes, Isiah Mustafa, Robert Cray

Piers Morgan, Joey King, Jaron and the Long Road to Love

Bill O'Reilly, Adam Shankman, Lyle Lovett

Rachel Weisz, Tony Robbins, Gaslight Anthem

Wanda Sykes, Ben Steinbauer, Jack Rebney, 3OH!3

Chelsea Handler, Matt Bomer, Metric

Zac Efron, Lior Suchard, the Black Keys

Don Rickles, Dwyane Wade, KISS

Craig Kilborn, Stephen Moyer, the Swell Season

Ellen Page, Austin "Chumlee" Russell & Corey Harrison, Grace Potter & the Nocturnals

Tracy Morgan, Drew Brees, Flo Rida

Jennifer Love Hewitt, Jay Baruchel, Nikki & Rich

Seth Meyers, Jonathan Hillstrand & Josh Harris, Tracy Bonham

Vice President Joe Biden, Adrien Brody, Chris Isaak

Steve Carell, Jane Lynch, Michael Palascak

Dave Salmoni, John C. Reilly, Big Boi

Jason Segel, Jenni "JWoww" Farley, Enrique Iglesias

Cameron Diaz, Dan Riskin, Lee DeWyze

Tom Cruise, Bryce Dallas Howard, Sharon Jones & the Dap-Kings

Jeremy Piven, Louis C.K., Drake

Queen Latifah, Mike "The Situation" Sorrentino, Robert Randolph

Dakota Fanning, Daniel Tosh, Crystal Bowersox

David Spade, Dan Riskin, Kelis

Jonah Hill, Quinton "Rampage" Jackson, Punch Brothers

Lauren Graham, Rob Schneider, Matisyahu

Robert Pattinson, Emma Roberts, Travie McCoy

Josh Brolin, Ashley Greene, Cee-Lo

Tim Allen, Against Me!

Denis Leary, Judd Apatow, Alanis Morissette

Adam Sandler, Rachel Maddow, OK Go

Chris Rock, Nicole "Snooki" Polizzi, Sting

Howie Mandel, Jillian Michaels, Hole

Colin Farrell, Elisabeth Moss, Kevin Eubanks

Katherine Heigl, Matthew Morrison, Allison Moorer

Kathy Griffin, Paula Deen, Hanson

Bret Michaels, Jane Krakowski, John Butler Trio

Russell Brand, David Gregory, Bettye Lavette

Kiefer Sutherland, Mary Lynn Rajskub, Adam Lambert

Chelsea Handler, Chris Matthews, Sarah McLachlan

Eddie Murphy, Carrie Ann Inaba, Bruno Tonioli, Damian Marley with Nas

Michael Douglas, Charles Barkley, Joe Nichols

Bill Cosby, Ricky Gervais, Taio Cruz

Donald Trump, the Jonas Brothers, Neon Trees

Garry Shandling, Ellie Kemper, Jakob Dylan

Betty White, Jarod Miller, Macy Gray

Amanda Seyfried, Guy Fieri, Luke Bryan

Laura Bush, Jessica Kirson, Limp Bizkit

Don Cheadle, Erin Andrews

Samuel L. Jackson, Kara DioGuardi, Jason Derulo

Robert Downey Jr., Mindy Kaling

Scarlett Johansson, Frank Caliendo, Michael Bolton

Julia Louis-Dreyfus, Jon Favreau, Godsmack

Mickey Rourke, Ashley Graham

Arnold Schwarzenegger, Sig Hansen, Laura Bell Bundy

Chelsea Handler, Aqualung

Jessica Simpson, Jackie Earle Haley, Dierks Bentley

Joel McHale, "Real Housewives of New Jersey" Caroline Manzo, Jacqueline Laurita & Teresa Giudice, Melissa Etheridge

Christopher Mintz-Plasse, David Axelrod, Creed

Jeff Corwin, Pierce Brosnan, Maxwell

Jennifer Lopez, Donald Glover, Natalie Merchant

Heidi Klum, Ken Jeong, Smashing Pumpkins

Brooke Shields, Phoenix

Hugh Jackman, Betty White, Collective Soul

Kate Gosselin, Kenny Chesney

Tracy Morgan, Chloe Moretz, Alan Jackson

Nicolas Cage, Lisa Lampanelli, Lady Antebellum

Russell Crowe, Jenna Elfman, Sade

Julie Scardina, Mary McCormack, Michael Kosta

Demi Moore, Rep. Barney Frank, Train

David Duchovny, Kendra Wilkinson-Baskett, Corinne Bailey Rae

Kirstie Alley, David Boreanaz, Slash & Andrew Stockdale

Randy Jackson, Matthew & Amy Roloff, Monica

Zachary Levi, Bear Grylls, Justin Bieber

Bill Maher, Wayne Vandenlangenberg, OneRepublic

Joy Behar, Thomas Haden Church, Shooter Jennings

Lauren Graham, Karl Rove, Joss Stone

Craig T. Nelson, Rumer Willis, Ludacris

Miley Cyrus, Tom Papa, Puddle of Mudd

Ed Helms, Pamela Anderson, Snoop Dogg

Gerard Butler, Sofia Vergara, Rodrigo y Gabriela

Charles Barkley, Kenny Smith, Ernie Johnson, k.d. lang

John Cusack, Heidi Montag, Barenaked Ladies

Janet Jackson, Clark Duke, Orianthi

Dwayne Johnson, kid inventors, Switchfoot

Hugh Jackman, Betty White, Collective Soul

Terry Bradshaw, Kara DioGuardi, Ziggy Marley

Dakota Fanning, Judd Apatow, Katharine McPhee

Dana Carvey, Kim Kardashian, Colbie Caillat

Kristen Stewart, Guy Fieri, Ryan Bingham

Christoph Waltz, Dave Salmoni, Joan Jett & the Blackhearts

Simon Cowell, Richard Roeper, Ben Harper

Morgan Freeman, Meredith Vieira

Brett Favre, Matthew McConaughey, Jason Reitman

"Jaywalk All-Stars" with the cast of "Jersey Shore", Chelsea Handler, Apolo Anton Ohno, Avril Lavigne

Sarah Palin, Shaun White, Adam Lambert

Jamie Foxx, Lindsey Vonn, Brad Paisley