Former President Bill Clinton, Patti Scialfa

Danny DeVito, Larry David, Avril Lavigne

Jessica Alba, George Saunders, The Manchester Orchestra

Rachael Ray, Frank Rich, Arctic Monkeys

Jodie Foster, Glen Hansard & Markéta Irglová

Dr. Phil McGraw, Andy Kindler, Suzanne Vega

Viggo Mortensen, Kat Von D, Daughtry, a Top Ten List presented by 10 NASCAR stars

Regis Philbin, Chamillionaire

Jamie Foxx, Jimmy Smits, Will.I.Am

Kate Walsh, Kevin Smith, Rascal Flatts

Jennifer Garner, Ken Burns, Chaka Khan

Stupid Human Tricks, Whoopi Goldberg, Melissa Etheridge

Paris Hilton, Emile Hirsch

Sean Penn, Barry Sonnenfeld, Ben Harper

Jude Law, Sarah Silverman, John Fogerty

Alec Baldwin, Faith Hill

Nicolette Sheridan, Tony Snow, Rihanna

Bob Newhart, Angela Kinsey, Iron and Wine

George Clooney, Kid Rock

Jennifer Lopez, Alan Greenspan

Stephen Colbert, Eva Mendes, Queens of the Stone Age

Anne Heche, Sue Johanson, Mariza

Halle Berry, Bill Hader, Spring Snake Symphony

Jake Gyllenhaal, Connie Britton, 50 Cent

Richard Simmons, Casey Affleck, Sondre Lerche

Rebecca Romijn, Jimmie Walker, LeAnn Rimes

Steve Carell, Chris Russo, Chris Elliott, Band of Horses

Amanda Peet, Patrick Warburton, Jeff Caldwell

Jerry Seinfeld, Joe Torre

Jennifer Connelly, Slash, Nicole Atkins

David Spade, Penn & Teller, Jonathan Papelbon

Dr. Phil McGraw, Ryan Adams

Bill Murray, Jay-Z

Robin Williams, Lupe Fiasco

Bill Maher, Ellen Page, the cast of Broadway's "Young Frankenstein"

Donald Trump, Shooter Jennings

Tom Hanks, Gov. Mike Huckabee

Lucy Liu, Alex Roy, MGMT

Morgan Freeman, Tom Brokaw, Chuck Prophet

Howard Stern, Ayo

Tracy Morgan, Kat Von D, Dropkick Murphys

Katie Holmes, Frank Caliendo, Maroon 5

Denzel Washington, Don Rickles

Michael Douglas, Katherine Heigl, Wyclef Jean

Sylvester Stallone, the Teutul family, the Mars Volta

Diane Keaton, Jim Gaffigan

Sarah Michelle Gellar, Dan Patrick, Ringo Starr

Sen. John Edwards, Diablo Cody, Josh Ritter, David "Fathead" Newman

Charles Grodin, New York Giant Lawrence Tynes, The Redwalls

Julia Louis-Dreyfus, T.J. Miller, Super Furry Animals

Nathan Lane, Jake Johannsen

Jessica Alba, Julie Chen, The Whigs

Bill Cosby, Lake Bell, The Matt Savage Trio

Dr. Phil McGraw, Lena Headey, Gary Allan

Stupid Human Tricks, Eva Longoria Parker, Colbie Caillat

Paris Hilton, Artie Lange, Vampire Weekend

Sen. Hillary Clinton, Sheryl Crow

Matthew McConaughey, Gary Mule Deer, Sheryl Crow

Eli Manning, Vince Vaughn, A Fine Frenzy

Kate Hudson, Jack Hanna

Colin Farrell, Blake Lively, Lenny Kravitz

Kate Walsh, Jason Sudeikis, OK Go and Bonerama

Evangeline Lilly, Marisa Miller, Brad Paisley

Martin Short, Amy Ryan

Regis Philbin, Joseph Arthur

Charles Barkley, Bill Burr

Dennis Quaid, Ryan Newman, Sharon Jones and the Dap-Kings

Randy Jackson, Saffron Burrows, Ray Davies

Amy Sedaris, Erika Jensen, Foo Fighters

Steve Martin, hand shadows performance with Raymond Crowe

Diddy, Al Lubel

Will Ferrell, Michael McDonald

Courteney Cox, Thomas Friedman, Chingy with Ludacris

Kid Scientists, Natalie Portman, Kenna

Amy Adams, Jamie Oliver, Liam Finn

Woody Harrelson, Tommy Tiernan

Jim Carrey, Paula Abdul

Martha Stewart, Snoop Dogg

Charlize Theron, Lewis Black, British Sea Power

Kate Beckinsale, Graham Colton

Jaime Pressly, Brian Regan

Rainn Wilson, Mike Golic & Mike Greenberg, Bell X1

Al Franken, Lauren Conrad, The Cribs

Brooke Shields, Seth Meyers, Gutter Twins

Demi Moore, Anthony Bourdain, Counting Crows

Kate Bosworth, John Witherspoon, The Raveonettes

Brian Williams, Judy Greer, Langhorne Slim

Helen Mirren, Jose Canseco

Sen. John McCain, Cat Power

George Clooney, Norah Jones

Renee Zellweger, Gayle King, Paddy Casey

Ellen Pompeo, Jay-Z, Mary J. Blige

Al Pacino, David Wright

Kelsey Grammer, Kristen Bell, Rogue Wave

Uma Thurman, Graham Rahal, The Gossip

Kelly Ripa, Dr. John P. Holdren, The Black Keys

Amy Poehler, Jason Segel, Jordan Zevon

Billy Crystal, Maria Sharapova

Helen Hunt, Chris "Mad Dog" Russo, Kathleen Edwards

Danica Patrick, Russell Brand, Tokyo Police Club

Tina Fey, Brett Favre, Estelle

Craig Ferguson, Ira Glass, The Black Crowes

Gwyneth Paltrow, Richard Lewis, The Roots with Chrisette Michele

Robert Downey Jr., Alicia Keys

Matthew Broderick, Heidi Montag, Josh Groban

John Goodman, Bear Grylls, Robyn

Patrick Dempsey, Isabella Rossellini, Nick Lowe

Jimmy Kimmel, Lance Burton, Jimmy Eat World

Ashton Kutcher, Mac King, Steve Winwood

Emile Hirsch, Tom Dreesen, Dirk Arthur

Paris Hilton, Steve Wyrick, Panic at the Disco

Barbara Walters, Cobie Smulders, Penn & Teller

Stupid Pet Tricks, Shia LaBeouf, N.E.R.D.

Regis Philbin, Laura Dern, Death Cab for Cutie

Jack Hanna, Kid Rock

America Ferrera, Russell Brand, Terry Fator

Teri Hatcher, Robert F. Kennedy Jr.

Kevin Spacey, Sen. Jim Webb, Sara Bareilles

Harrison Ford, Ali Lohan, Leona Lewis

Kristin Davis, Jimmy Buffett

Sarah Jessica Parker, Piedmont Bird Callers, Republic Tigers

Liv Tyler, Sue Johanson, Tommy Johnagin

Adam Sandler, Scott Dixon, Donna Summer

Julianne Moore, Morgan Spurlock, a performance from the Broadway musical "South Pacific"

Jack Black, Esperanza Spalding

Julia Roberts, Al Green

Jenna Fischer, Jim Nantz, Gavin Rossdale

Tom Brokaw, Elettra Wiedemann, Gnarls Barkley

Mark Wahlberg, Jeff Peckman, Alanis Morissette

Zooey Deschanel, Scott McClellan, Jakob Dylan

Ben Kingsley, Artie Lange, Emmylou Harris

Whoopi Goldberg , Spencer Pratt, Nick Griffin

Mike Myers, BMX star Kevin Robinson, Adele

Steve Carell, Lance Armstrong, Dr. John

Kevin Garnett & Ray Allen, Jane Krakowski, Martha Wainwright

Jason Bateman, Teri Garr, Keyshia Cole

Denis Leary, The Baseball Project

Will Smith, Joe Buck

Charlize Theron, Richard Belzer, Mötley Crüe

Abigail Breslin, Barry Sonnenfeld, Tift Merritt

Mary-Kate Olsen, Jim Gaffigan, Gavin DeGraw

Morgan Freeman, Kaley Cuoco, Wild Sweet Orange

Pierce Brosnan, Bud Selig, Jason Mraz

Meryl Streep, Aaron Eckhart, Randy Travis

Maggie Gyllenhaal, Neil Young, The Hold Steady

Ricky Gervais, John Mellencamp

Rosie Perez, David Sedaris

Will Ferrell, Adam Savage & Jamie Hyneman

Amanda Peet, Jon Hamm, Augustana

John C. Reilly, Jane Mayer, Grizzly Bear

David Duchovny, Black Kids

Nathan Lane, Larry "Bubbles" Brown, Randy Bachman

Gillian Anderson, Simon Pegg, We Are Scientists

Kevin Costner, Bob Sarlatte, Low vs. Diamond

Pamela Anderson, James Franco, Atmosphere

Luke Wilson, Mindy Kaling, Michael Lauziere

Richard Simmons, Mary-Louise Parker

Seth Rogen, Fleet Foxes

Kelly Ripa, Steve Coogan, Spiritualized

Penelope Cruz, Danny Way, Randy Newman

Kiefer Sutherland, Rumer Willis, Phil Vassar

Donald Trump, Dwayne Kennedy

Shawn Johnson, Tracy Morgan, Solange

Bryan Clay, Don Cheadle, Little Anthony & The Imperials

Kerri Walsh & Misty May-Treanor, Neil Patrick Harris, Nas

Brad Garrett, Blake Lively, Randy Houser

Amy Sedaris, Kim Kardashian, Brian Regan