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

Season 21

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

Talk

Comedy

The Tonight Show with Jay Leno

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Season 20

Specials

Jay Leno hosts some of the biggest celebrities in the world.