Ron Howard, Nicole "Snooki" Polizzi, Sick Puppies

Queen Latifah, Gustavo Dudamel, Jazmine Sullivan

Jamie Foxx, Leighton Meester

Hilary Swank, Jesse Eisenberg, Los Lobos

Jim Parsons, Hailee Steinfeld, Lukas Nelson

Randy Jackson, Jennifer Lopez, Ryan Seacrest, Steven Tyler, Dan Ahdoot, Diane Birch

Bill Maher, Cam Newton, the Duke Spirit

Seth Rogen, Brady Barr, Bettye Lavette

Cameron Diaz, Eric Stonestreet, the Civil Wars

Michael Douglas, Julie Scardina, Randy Rogers Band

Gordon Ramsay, Kathleen Madigan, Maroon 5

Ashton Kutcher, Aubrey Plaza, Neon Trees

Amy Poehler, Mike "The Situation" Sorrentino, Grace Potter & the Nocturnals

Ben Affleck, the Decemberists

Kathie Lee Gifford & Hoda Kotb, Armie Hammer, Hayes Carll

Dana Carvey, Maggie Q, Lizz Wright

Jason Statham, Melissa McCarthy, White Lies

Annette Bening, Frank Caliendo, Amos Lee

Kathy Bates, Brad Womack, Billy Currington

Justin Bieber, Jay Mohr, the Band Perry

Adam Sandler, Larry the Cable Guy, Esperanza Spalding

Helena Bonham Carter, Timothy Olyphant, One eskimO

Jesse Eisenberg, Jennifer Lawrence, Ryan Bingham

Jeff Bridges, Dianna Agron, Bobby Long

Hugh Laurie, Hailee Steinfeld, Finesse Mitchell

Mark Wahlberg, Lachlan Patterson, James Blunt

Javier Bardem, Paula Abdul, Merle Haggard

Matt LeBlanc, Clay Matthews, Ricky Martin

Rob Lowe, Amber Riley, Nicki Minaj

Kathy Griffin, Gayle King, the Black Keys

Lady Gaga, Sofia Vergara, John Legend

Liam Neeson, Dave Salmoni, Gretchen Wilson

Charles Barkley, Jenni "JWoww" Farley, Red

Jenna Fischer, Abigail Breslin, Miguel

Mark Harmon, Dwight Howard, 30 Seconds to Mars

The Tonight Show with Jay Leno  Season 19  Episode 36

Owen Wilson, Rachel Maddow, Anberlin

Randy Jackson, Nick Swardson, Travie McCoy

Meredith Vieira, DJ Pauly D, Hanson

Emily Blunt, Jackson Murphy, Chris Medina

Christina Appelgate, John Fulton, Michael Franti

Matt Damon, Betty White, Cake

Simon Cowell, Jeff Gordon, Travis Barker

Jerry Seinfeld, Bailee Madison, Darlene Love

Aaron Eckhart, Christie Brinkley, Thompson Square

Jane Lynch, Chris Matthews, Avril Lavigne

Wanda Sykes, Simon Pegg, Juanes

Matthew McConaughey, Rizwan Manji, Michael Kosta

Rainn Wilson, "Epic Meal Time" with Harley Morenstein & Sterling Toth, Serj Tankian

Robert Pattinson, Whitney Cummings, Alice Cooper

Zachary Levi, Lisa Lampanelli, Raphael Saadiq

Julie Scardina, Rebecca Black, Duran Duran

Carol Burnett, Jason Ritter, Keith Urban

Kirstie Alley, Jon "Bones" Jones, Peter, Bjorn & John

Jennifer Hudson, William H. Macy

Russell Brand, Lorraine Nicholson, Los Lonely Boys

Howie Mandel, Zachary Gordon, Dierks Bentley

Helen Hunt, Sammy Hagar, Good Charlotte

Kourtney & Kim Kardashian, Fareed Zakaria, Mary Mary

Vin Diesel, Ashley Tisdale, Scissor Sisters

Tracy Morgan, Neve Campbell, Augustana

Dwayne Johnson, Bethany Hamilton, Fitz & the Tantrums

Matthew Morrison, Carrie Underwood

Emma Roberts, Gary Busey, Jeff Beck with Imelda May

David Arquette, Ben Bailey, Far East Movement

Jamie Foxx, k.d. lang

Kristen Bell, Austin "Chumlee" Russell

Jessie J

Tyler Perry, Kendra Wilkinson, Bright Eyes

John Travolta, Eliza Doolittle

Christina Aguilera, Paul Reiser, Alison Krauss & Union Station featuring Jerry Douglas

Lindsay Lohan, Jillian Michaels, the Airborne Toxic Event

Rene Russo, Kevin Hart, Buddy Guy

Chelsea Handler, Judd Apatow, OK Go

Rob Lowe, Moby

Paul Walker, Donny & Marie Osmond

Penelope Cruz, Ricky Martin

Kate Hudson, Chris Hemsworth, Sergio Mendes with Siedah Garrett

Wanda Sykes, Ralph Macchio, Priscilla Ahn

Steven Tyler, Aubrey Plaza, the Civil Wars

Jennifer Lopez, Chris Colfer, BC Jean

Julie Scardina, Ginnifer Goodwin, Def Leppard

Dick Van Dyke, Khloe Kardashian & Lamar Odom, Steve Earle

Norm Macdonald

Jodie Foster, Ken Jeong, Rodrigo y Gabriela

Eva Mendes, storm chaser Reed Timmer, Tedeschi Trucks Band

Ryan Seacrest, Jordana Brewster, TV on the Radio

Ed Helms, Chelsea Kane, Iron & Wine

Jack Black, Mike Huckabee, Parachute

Kirstie Alley, Erik Rivera, Il Volo

Dustin Hoffman, Meghan McCain, the Script

Meredith Vieira, Demetri Martin, Ben Harper

Chaz Bono, Brady Barr, Foster the People

Piers Morgan, Rico Rodriguez, Scott Weiland

Paris Hilton, Dhani Jones, INXS with Pat Monahan

Katie Couric, Cee-Lo Green

Kevin Bacon, Bethenny Frankel, OneRepublic

Jada Pinkett Smith, Elle Fanning, Lenka

Jim Carrey, Selena Gomez, Tinie Tempah

Bill Cosby, Kris & Bruce Jenner, Neon Trees

Season 19

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

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