Whitney Cummings, Nicole

Tracy Morgan, Rick & Corey Harrison, Shaggy

Michelle Williams, Josh Lucas, Chris Cornell

Glenn Close, Trevor Noah, Van Hunt

Janet Jackson, Larry the Cable Guy, Eli Young Band

Queen Latifah, Paul

Liam Neeson, Jack's Mannequin

Gerard Butler, Betty White

Tilda Swinton, Jennifer Hudson, Graffiti6

Sam Worthington, Sherri Shepherd, Adam Lambert

Jennifer Garner, Ross Matthews, Parachute

Wanda Sykes

Steven Tyler, Ryan Seacrest, Randy Jackson, Sarah Colonna

Madonna, Chris Colfer, Joe Perry

Michelle Obama, Mark Harmon, Imelda May

Daniel Radcliffe, Vanessa Hudgens, Evanescence

Drew Barrymore, Blake Shelton

Debra Messing, Jean Dujardin, Bush

Dwayne Johnson, Miranda Cosgrove, Cirque du Soleil

Chelsea Handler, Jon Huntsman, 2Cellos

Chris Pine, Lisa Lampanelli, Anthony Hamilton

Denzel Washington, Octavia Spencer, Estelle

Rachel McAdams, Cee-Lo Green

Jennifer Lopez, the Civil Wars

Tyler Perry, Alexandra Wentworth, the Cranberries

Bill Maher, Punch Brothers

Amanda Seyfried, Billy Gardell, Monica, Brandy

Christina Aguilera, Dave Salmoni, The Fray

Taylor Swift, Michael Clarke Duncan, Robert Randolph, Los Lobos, Chris Layton

Bill O'Reilly, Rob Riggle, Rumer

Tim Allen, Rocket City Rednecks

Meredith Vieira, Jackson Murphy

Jennifer Aniston, Adam Levine

Megan Fox, Michel Hazanavicius, Mariachi El Bronx

Rob Schneider, Khloe Kardashian Odom, Mona

Sen. John McCain, Elizabeth Olsen, Romeo Santos

Julianne Moore, Dr. Brady Barr, Chickenfoot

Emily Blunt, Geoff Stults, Scars on 45

Jessica Simpson, Adam Carolla, Soja

Jonah Hill, Bethenny Frankel, Shooter Jennings

Channing Tatum, Drew Brees, Meat Loaf

Kiefer Sutherland, Kathryn Hahn, Andy Grammer

Jimmy Fallon, 8-year-old presidential whiz kid H.L. McCullough, Toby Keith

Jamie Lee Curtis, Armie Hammer

Rep. Ron Paul, Frank Caliendo, the Wanted

Kim Kardashian

Arsenio Hall, Lily Collins

Christina Aguilera, Melanie Fiona featuring J. Cole

Elizabeth Banks, Carson Daly

The Pierces

Rainn Wilson, Debbie Gibson, Gavin DeGraw

Piers Morgan, Liam Hemsworth, Mat Kearney

Nicole Richie, Alan Jackson

Betty White, D.J. Pauly D

Maya Rudolph, Jason Biggs, Gym Class Heroes

David Gregory, Cee-Lo Green, Seal

Zac Efron, Jennie Garth, Grace Potter and the Nocturnals

Kristin Chenoweth, Julie Scardina, Rodrigo y Gabriela

Jane Lynch, Kevin Hart, Esperanza Spalding

Josh Hutcherson, Rachel Maddow, Eric Turner featuring Lupe Fiasco and Tinie Tempah

Albert Brooks, Austin

Blake Shelton, Chris Diamantopoulos, Feist

Jason Segel, Anna Faris, Far East Movement

Jesse Tyler Ferguson, Aubrey O'Day, Train

Jack Black, Daniel Holzman & Michael Chernow, Beirut

Adam Levine, Ziggy Marley

Diane Keaton, Natalie Coughlin, Moby

Mel Gibson, the Wanted

Steve Martin, Rashida Jones, Steve Martin & the Steep Canyon Rangers

Cameron Diaz, William Shatner, Lee Brice

Scarlett Johansson, Blake Shelton, K'Naan featuring Nelly Furtado

Robert Downey Jr., Katharine McPhee, Toast To Freedom

Kristen Stewart, James Morrison

Michelle Pfeiffer, Bear Grylls, Snow Patrol

Rick Santorum, Taylor Kitsch, B.o.B., O.A.R.

Garry Shandling, Alison Brie, the winner of 'The Voice'

Howie Mandel, Vinny Guadagnino, Sara Watkins

Jenna Fischer, Jay Mohr

Kourtney, Kim & Khloe Kardashian, Donny Deutsch, Karmin

Wanda Sykes, David Hasselhoff, Santana

Joel McHale, Jarod Miller, Bobby Brown

Hugh Laurie, Robert Griffin III

Sherri Shepherd, Julianne Hough, Tenacious D

Kevin Costner, Bailee Madison, Lisa Marie Presley

Josh Brolin, Ali Wentworth, Glenn Frey

Charlize Theron, Jeffrey Dean Morgan, Juanes

Glenn Close, the winner of American Idol, Nelly Furtado

Gen. Colin Powell, Greg Gadson, All American Rejects

Martin Short, Aubrey Plaza, Def Leppard

Emma Stone, Chris Hemsworth, Chris Robinson Brotherhood

Julia Louis-Dreyfus, the Beach Boys

Catherine Zeta-Jones, Louis Zamperini, Bret Michaels

Tom Cruise, skydivers Felix Baumgartner & Joe Kittinger, Kool & the Gang

Elizabeth Banks, Dan Patrick, Brandi Carlisle

Patrick Duffy, Linda Grey, Larry Hagman, Meghan McCain, Meiko

Terry Bradshaw, Ernie Brown Jr., Neal James, Rachel Bradshaw

Penelope Cruz, Rick Harrison, We Are Augustines

Salma Hayek, Adam Brody, Olly Murs

Steve Carell, Cory Booker, Glen Hansard

Matthew McConaughey, Natasha Leggero, Grouplove

Season 20

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

Talk

Comedy

The Tonight Show with Jay Leno

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Season 16

Season 17

Season 18

Season 19

Season 21

Specials

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