Kevin Hart, Betty White, Dwight Yoakam

Arnold Schwarzenegger, Chumlee & Rick Harrison, Ziggy Marley

Courteney Cox, Joy Behar, Youngblood Hawke

Bill Maher, Nicole

Emma Stone, Josh Gad, the Whigs

Big Bad Voodoo Daddy

Ryan Seacrest, Keith Urban, Randy Jackson, Anthony Jeselnik, For King and Country

Ben Affleck, Kristen Bell, Rodriguez

Nicki Minaj, Billy Connolly, The Saturdays

Jessica Simpson, D.L. Hughley, Vintage Trouble

Mark Wahlberg, Ali Wentworth, JJamz

Naomi Watts, Richard Engel, Train

Chris Tucker, Bob Costas, Big Boi

Sally Field, Michael Kosta, Lord Huron

Dana Carvey, Emmy Rossum, Ben Harper with Charlie Musselwhite

Heidi Klum, Seann Willam Scott, Gary Allan

Dustin Hoffman, Kenny Loggins and Blue Sky Riders

Robert DeNiro

Catherine Zeta-Jones, Donny Deutsch, Lady Antebellum

Whitney Cummings, Jackie Weaver, Aaron Neville

Charlie Sheen, Holly Williams

Piers Morgan, Quvenzhane Wallis, Benh Zeitlin, Lisa Loeb

Wanda Sykes, Branford Marsalis

Hugh Jackman, Jessica Chastain, Michael Bolton

Josh Duhamel, Kathryn Bigelow, Lianne La Havas

Tim McGraw, Bar Refaeli

Amy Adams, Adam Carolla, Hunter Hayes

Seth MacFarlane, Jenna Elfman, Norah Jones

James Spader, Lior Suchard, Far East Movement

Charles Barkley, Bob Fisher, Jewel

Anne Hathaway, Lester Holt, Eli Young Band

Jarod Miller, Timothy Olyphant, Colbie Caillat & Gavin DeGraw

Kathy Griffin, David Feherty, FM Radio

Kevin Bacon, Dennis Rodman, Kevin Eubanks

Robin Wright, Josh Gad, Bonnie Raitt

Chelsea Handler, Edythe Kirchmaier, Sky Blu

Arsenio Hall, Tristan Prettyman

Meredith Vieira, Richard Roeper, thenewno2

Russell Crowe, Eli Roth, Robert Randolph with the Slide Brothers

Colin Farrell, Joey King, Boz Scaggs

David Duchovny, J.B. Smoove, Father John Misty

Steve Carell, Joey King, Shooter Jennings

Bill O'Reilly, Abigail Breslin, the Mavericks

Halle Berry, Rachel Maddow, Ashley Monroe

Olivia Wilde, Nick Offerman, Buddy Guy and The Experience Hendrix All-Star Band

Jerry Seinfeld, Mark Cuban, Jose James

James Franco, Jay Mohr, Owl City with Yuna

Craig Ferguson, Vera Farmiga, Harper Simon

Morgan Freeman, Olympic wrestlers Rulon Gardner & Henry Cejuda, The James Hunter Six

Jenna Fischer, Dennis Rodman, Black Prairie

Vanessa Hudgens, Chris O'Dowd, Gary Clark Jr.

Dwayne Johnson, Chris Paul, Atlas Genius

Don Cheadle, Louie Anderson, Wiz Khalifa feat. Akon

Gerard Butler, Keegan-Michael Key & Jordan Peele, Crystal Bowersox

Keith Urban, Paula Deen, Django Django

Kristin Chenoweth, magician Justin Willman, Josh Groban

Kim Kardashian, Willie Geist, Imagine Dragons

Matthew Perry, Kristen Schaal, The Goo Goo Dolls

Blake Shelton, Jim Rome

Rosario Dawson, Max Greenfield, Gloriana

Eva Longoria, Terry Crews, Cavalia's Odysseo

Demetri Martin, animal trainer Julie Scardina, Gin Wigmore

Julia Louis-Dreyfus, Anthony Jeselnik, Vintage Trouble

Rebel Wilson, Jackson Galaxy, Hanson

Charlie Sheen, coach Andy Enfield, Brad Paisley

LL Cool J, Andy Cohen, Tegan and Sara

Adam Levine, Cyndi Lauper, The Airborne Toxic Event

Diane Keaton, Trevor Moore, Jake Bugg

Carol Burnett, Stephen Amell, Plain White T's

Emily Blunt, Tom Cruise, Black Rebel Motorcycle Club

Gwyneth Paltrow, JB Smoove, Billy Ray Cyrus

Robert Downey Jr., Avril Lavigne

Ben Kingsley, Larry the Cable Guy, The Band Perry

Cher & Georgia Holt, Dov Davidoff, Florida Georgia Line

Kathy Griffin, Eli Roth, Cheap Trick

Matt Lauer, Awolnation

Chris Evans, Kevin Smith

Magic Johnson, Savannah Guthrie, Fall Out Boy

Connie Sawyer, Patty Griffin

Ken Jeong, Emeli Sandé

Shakira, Marc Maron, Tom Jones

Aaron Eckhart, Sherri Shepherd, 98 Degrees

Miranda Lambert, Ross Mathews, Pistol Annies

Wanda Sykes, Martha Stewart, Drop City Yacht Club

Usher, Nick Offerman, Pyyramids

Adam Sandler, Phil Jackson, Family of the Year

Mitt Romney, “American Idol” winner Candice Glover

Bradley Cooper, Heidi Klum, The-Dream with Kelly Rowland

Eric Stonestreet, Jeremy Wade, Thompson Square

Vin Diesel, Jeff Foxworthy, The Lone Bellow

Tyler Perry, Isla Fisher, Shout Out Louds

Howie Mandel, Sal Basille & Francis Garcia, Sigur Rós

Vince Vaughn, Kenny Smith, Scotty McCreery

Owen Wilson, Wayde King & Brett Raymer, LeAnn Rimes

Danny McBride, Khloe Kardashian Odom, The Wanted

Henry Cavill, Jessica Buchanan & Erik Landemalm, She & Him

Russell Crowe, Andrea Bocelli

Kevin Bacon, Mel B, Bad Company

Jamie Foxx, Jimmy Connors, Matthew Morrison

Kevin Hart, Jeremy Scahill, Trace Adkins & Colbie Caillat

Carson Daly, Betty White, Timeflies

Armie Hammer, Dave Salmoni, The Boxer Rebellion

Billy Crystal, Pitbull feat. Danny Mercer

Kathy Griffin, Billy Gardell, Grouplove

David Gregory, J Chris Newberg, “The Voice” winner Danielle Bradbery

Kristin Davis, Harvey Fierstein, The Mowgli's

Terry Bradshaw, Steve Byrne, Joseph Arthur

Steve Carell, Ken Ilgunas, Barenaked Ladies

Sandra Bullock, Bob Saget, Il Volo

Whitney Cummings, Alex Minsky, John Fogerty

David Spade, Joey King, Grace Potter & The Nocturnals

Wanda Sykes, India.Arie

Charlie Day, Jeffrey Dean Morgan, Lionel Richie

Dane Cook, Nev Schulman, Matt Nathanson

John Malkovich, Olivia Munn, Blackberry Smoke

Helen Mirren, Ben Schwartz, The Olms

Bill Hader, Passenger

Savannah Guthrie, Anthony Jeselnik, Johnnyswim

Zachary Levi, Danica Patrick, Talib Kweli feat. Nelly & Abby Dobson

Jane Lynch, Serena Ryder

Anthony Hopkins, Amy Schumer, Robert Randolph & The Family Band

Howie Mandel, Marisa Miller, Sara Bareilles

Gillian Anderson, Jim Rash & Nat Faxon, Kenny Chesney

Aaron Paul, Selena Gomez

Ashton Kutcher, Jayma Mays, Hiatus Kaiyote

Cate Blanchett, Michael B. Jordan, Court Yard Hounds

Katy Perry, Cris Collinsworth, Kacey Musgraves

Kristen Bell, Phillip Phillips

Kristin Chenoweth, Josh Gad

Kate Hudson, Bob Costas, Kopecky Family Band

Casey Affleck, Allison Janney

Meredith Vieira, Jim Norton, Charlie Worsham

Bryan Cranston, Amos Lee

Matt LeBlanc, Mark Cuban, KT Tunstall

Matt Damon, Anna Faris, Parachute

Robin Williams, Gavin DeGraw

Jason Sudeikis, “Fry It & Try It” with Jim Stacy, White Lies

Jeff Daniels, Sherri Shepherd, Quinn Sullivan

Josh Duhamel, Macklemore & Ryan Lewis

Matt LeBlanc, Kathryn Hahn, Sky Blu

Julie Scardina, Rod Stewart

Senator John McCain

Bill Maher, Shaun White, Bad Things

Christina Applegate, Rob Corddry, White Lies

Vince Vaughn, Vintage Trouble

Simon Cowell

Martin Short, Meghan McCain, Backstreet Boys

Rose Byrne, Jennifer Nettles

Charlie Sheen, Jim Rome, Trombone Shorty

Hugh Jackman, OneRepublic

Zooey Deschanel, Terry Crews, Buena Vista Social Club

Chris Hemsworth, Kristen Schaal, Sheryl Crow

Neil Patrick Harris, Five for Fighting

Christina Aguilera, Joy Behar, Valerie June

Tim Allen, Dwayne Wade, Fitz and The Tantrums

Jimmy Fallon

Justin Timberlake, Paula Patton

Olivia Wilde, Adam Scott, Cher Lloyd

Dana Carvey, Cee-Lo Green, Goodie Mob

Julia Louis-Dreyfus, Ron Paul, Little Big Town

Sandra Bullock, 13 year-old chef Jack Witherspoon

Magic Johnson, Marjorie Johnson, Gary Clark Jr.

Joseph Gordon-Levitt, Jay Mohr, Ariana Grande & Mika

Kathy Griffin, Newt Gingrich, Demi Lovato

Julianne Moore, Billy Gardell

President George W. Bush & Laura Bush, Ben Harper with Charlie Musselwhite