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

Jennifer Lopez, Ryan Seacrest, Steven Tyler

Bill Maher, the Duke Spirit

Seth Rogen, Ted Williams, Bettye Lavette

Cameron Diaz, Eric Stonestreet

Michael Douglas, Julie Scardina

Gordan Ramsay, Kathleen Madigan, Maroon 5

Ashton Kutcher, Aubrey Plaza, Neon Trees

Amy Poehler, Mike "The Situation" Sorrentino

Ben Affleck, the Decemberists

Kathie Lee Gifford, Hoda Kotb

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

Coming soon...

Coming soon...

Coming soon...

Coming soon...

Coming soon...

Mark Wahlberg, James Blunt

Javier Bardem, Paula Abdul, Merle Haggard

Matt LeBlanc, Ricky Martin

Rob Lowe, Amber Riley, Nicki Minaj

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

Mark Harmon, Dwight Howard, 30 Seconds to Mars

TBA

Owen Wilson, Rachel Maddow, Anberlin

Nick Swardson, Travie McCoy

Meredith Vieira, DJ Pauly D

Emily Blunt, Jackson Murphy, Darlene Love

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

Jane Lynch, Chris Matthews, Avril Lavigne

Wanda Sykes, Simon Pegg, Juanes

Matthew McConaughey, Rizwan Manji

Rainn Wilson, Epic Meals 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, 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, Jesse Heiman, k.d. lang

Kristen Bell, Austin "Chumlee" Russell, Sara Evans

Diane Lane, Chris Jericho, Jessie J

Tyler Perry, Kendra Wilkinson, Bright Eyes

John Travolta, Eliza Doolittle

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

Kristin Chenoweth, 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, Maria Bamford, Ricky Martin

Kate Hudson, Chris Hemsworth, Sergio Mendes with Siedah Garrett

Katie Couric, Ralph Macchio, Priscilla Ahn

Steven Tyler, 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, Il Volo

Dustin Hoffman, the Script

Meredith Vieira, Ben Harper

Foster the People

Piers Morgan, the winner of "American Idol"

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

Jason Sudeikis, Adam Levine, Ziggy Marley

Kim Kardashian, Lior Suchard, Randy Travis with Josh Turner

Blake Lively, Blake Shelton, Scotty McCreery

Larry David, Pitbull with Ne-Yo

Josh Duhamel, Jill Scott

Larry the Cable Guy, Dorothy Custer, LMFAO

Rosario Dawson, Marc Anthony, Jackie Evancho

Louis C.K., Richard Engel, Raphael Saadiq

Justin Timberlake, Kevin Hart, the Antlers

Owen Wilson, Tom Papa, Plain White T's

Lisa Kudrow, Billy Gardell, Natasha Bedingfield

Julie Scardina, Billy Ray Cyrus

Kevin James, "The Voice" winner Javier Colon

Kathie Lee Gifford, Hoda Kotb, Ashton Shepherd

Howie Mandel, David Feherty, Joss Stone

Seth Meyers, Marjorie Johnson, Barry Manilow

Craig Ferguson, Rose Byrne

Don Rickles, Bristol Palin, Colbie Caillat

Bryan Cranston, Nancy Grace, Shaggy

Neil Patrick Harris, Buddy Valastro, Imelda May

Jenna Fischer, Ben Bailey, 3 Doors Down

Daniel Craig, Gavin DeGraw

Emma Stone, Adam Carolla, Rickey Minor, Grace Potter, Charles Bradley, Sharon Jones

Dolly Parton

Jessica Alba, Sue Johanson, Gomez

Shaun White, Olivia Wilde, Train

Vanessa Carlton

Matt LeBlanc, Freida Pinto, Stevie Nicks

Gillian Anderson, Aziz Ansari, Kelly Rowland

Ryan Reynolds, Sheryl Crow, Matt Nathanson

Katie Holmes, Novak Djokovic, Mat Kearney

Jeremy Piven, Kelly Osbourne

Roseanne Barr, Jason Momoa, Lykke Li

Dennis Miller, Dennis Rodman, Rye Rye featuring Robyn

Gordon Ramsay, Bryce Dallas Howard, Panic! at the Disco

Jesse Eisenberg, Mike "The Situation" Sorrentino, Cage the Elephant

Joel McHale, Viola Davis, Ximena Sarinana

Sam Worthington, Bailee Madison, The Game

Jane Fonda, Elizabeth Banks, Mana

Shaun White, Olivia Wilde, Train

Ryan Reynolds, Sheryl Crow, Matt Nathanson

Jason Sudeikas, Adam Levine, Ziggy Marley

Kathie Lee Gifford, Hoda Kotb, Captain Sig Hansen, Ashton Shepherd

Kim Kardashian, Lior Suchard, Randy Travis

Emma Stone, Adam Carolla, Rickey Minor

Justin Timberlake, Kevin Hart, The Antlers

Katie Holmes, Novak Djokovic, Mat Kearney

Dolly Parton, Ben Bailey

Louis C.K, Richard Engel, Raphael Saadiq

Julie Scardina and animals, David Koechner, Cake

Jeff Bridges, Nicole "Snooki" Polizzi

Allison Janney, Jay Mohr, OK Go

Heidi Klum, Kevin Smith, Fitz and the Tantrums

Dick Cheney, Kevin Hart, Andy Grammer

Wanda Sykes, Nick Swardson, Roger Daltrey

Kristin Chenoweth, Chris Colfer

Will Arnett, Tinie Tempah

Bill Maher, Octavia Spencer, Alice Cooper

Christina Applegate, Paul "DJ Pauly D" Delvecchio, Glen Campbell

Ellen DeGeneres, Bob Harper, Cobra Starship

Jane Lynch, Demetri Martin, Needtobreathe

Kevin Hart

Jason Statham, Michele Bachmann, Lady Antebellum

Simon Cowell, Natasha Leggero, Selena Gomez

Gerard Butler, Whitney Cummings, Kelly Clarkson

Amy Poehler, Joseph Gordon-Levitt, the Kooks

Jamie Foxx, Michelle Monaghan, Bush

Hugh Jackman, Maya Rudolph, Tony Bennett

Ryan Gosling, Pauley Perrette, Arctic Monkeys

Lauren Graham, Seth MacFarlane

Ed Helms, Deena Nicole Coretese, Lisa Hannigan

Albert Brooks, Chaz Bono, TV on the Radio

Hugh Laurie, the Airborne Toxic Event

Evangeline Lilly, Magic Johnson

Kim Kardashian, Kris Humphries, Kenny Wormald, LeAnn Rimes

Tim Allen, Theresa Caputo, Scotty McCreery

Jack Black, Steve Martin, Owen Wilson, Aubrey Plaza, Blondie

David Arquette, Darrell & Brandon Sheets, Puddle of Mudd

Aaron Eckhart, Julianne Hough, Amos Lee

Julie Bowen, Dave Salmoni, Imelda May

Zooey Deschanel, J.R. Martinez, Fountains of Wayne

Zachary Levi, Gloria Estefan

Terry Bradshaw, Rowan Atkinson, Game

Jonah Hill, Paula Deen, Chris Isaak

President Barack Obama

Amanda Seyfried, John Cho & Kal Penn, Patrick Stump

Chelsea Handler, Chris D'Elia, the Original 7ven

Adam Sandler, Drew Manning, Awolnation

Justin Bieber, Lloyd

Eddie Murphy, Robyn

Taylor Lautner, Martha Stewart, Daughtry

Kristen Stewart, Dave Attell, Joe Jonas

Miss Piggy, Mickey Rourke, Mute Math

Ellen Barkin, Henry Cavill, Cirque du Soleil \"Iris\"

Jason Segel, Kris Jenner, Lyle Lovett

Kelsey Grammer, Andrea Bocelli

Whitney Cummings, Chris Matthews, Il Divo

Kermit the Frog, Ricki Lake, Nicole Scherzinger

Amy Adams, Rocket City Rednecks, Miranda Lambert

Howie Mandel, Nicole \'Snooki\' Polizzi, Patrick Stump

Robin Williams, Vince Gill

Jimmy Fallon, Drew Brees, Gym Class Heroes

Jim Parsons, Meghan McCain, Tom Morello with Ben Harper

Dennis Miller, Javier Colon

Julie Scardina, Dane Cook, Hot Chelle Rae

Chelsea Handler, Dwight Howard, Gloriana

Kirstie Alley, Damon Wayans Jr., She & Him

Kathy Bates, Jay Mohr, Switchfoot

Bill Cosby, Raini Rodriguez, Iron & Wine

Melissa McCarthy, Gov. Rick Perry, T-Pain

Hilary Swank, Mike \"The Situation\" Sorrentino, Dia Frampton

Robert Downey Jr., Abigail Breslin, Alison Krauss & Union Station

Katherine Heigl, J.B. Smoove, Taio Cruz

Lea Michele, Adam Carolla, Neil Diamond

Katie Couric, Chris D\'Elia, Blake Shelton

Bill O\'Reilly, Jackie Evancho

Charlize Theron, Kevin Hart, Foster the People

Dana Carvey, Jason Reitman, Lenny Kravitz

Louis C.K., Common

Al Michaels & Cris Collinsworth, Elle Fanning, Robin Thicke

Rep. Ron Paul, Chris Cornell

Sandra Bullock, Diablo Cody, Pink Martini

Charles Barkley, Berenice Bejo, Amber Riley

Thomas Haden Church, "Turtle Man" Ernie Brown Jr., Johnny Mathis

Jonah Hill, Il Volo

Terry Bradshaw, Bailee Madison, Chris Isaak

Whitney Cummings, Nicole "Snooki" Polizzi, will.i.am

Coming soon...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 "DJ Pauly D" DelVecchio, Augustana

Liam Neeson, Jack's Mannequin

Gerard Butler, Betty White

Tilda Swinton, Jennifer Hudson, Graffiti6

TBA

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, Cirque du Soleil

Chelsea Handler, Jon Huntsman, 2Cellos

Chris Pine, Lisa Lampanelli, Anthony Hamilton

Denzel Washington, Estelle

Rachel McAdams, Cee-Lo Green

Jennifer Lopez, Jeff Dunham, the Civil Wars

Tyler Perry, Dorothy Custer, the Cranberries

Bill Maher, Alexandra Wentworth, Punch Brothers

Amanda Seyfried, Billy Gardell, Monica, Brandy

Dave Salmoni, the Fray

Taylor Swift, Michael Clarke Duncan, Robert Randolph, Cesar and David of Los Lobos, Chris Layton

Bill O\'Reilly, Rob Riggle, Rumer

Tim Allen, Rocket City Rednecks, Jessie Baylin

Meredith Vieira, Jackson Murphy, Redlight King

Jennifer Aniston, Adam Levine, Chiddy Bang

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, Robert Glasper Experiment featuring Ledisi

Rep. Ron Paul, Frank Caliendo, the Wanted

Kim Kardashian, Tennis

Arsenio Hall, Lily Collins

Christina Aguilera, Melanie Fiona featuring J. Cole

Elizabeth Banks, Carson Daly, Jake Owen

Mitt Romney, Megan Hilty, the Pierces

Rainn Wilson, Debbie Gibson, Gavin DeGraw

Piers Morgan, Liam Hemsworth, Mat Kearney

Nicole Richie, Alan Jackson

Betty White, Paul \"DJ Pauly D\" DelVecchio, Eric Huthinson

Maya Rudolph, Jason Biggs

David Gregory, Cee-Lo Green, Seal

Zac Efron, Grace Potter and the Nocturnals

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 \"Chumlee\" Russell & Corey \"Big Hoss\" Harrison, Neon Trees

Chris Diamantopoulos, Feist

Jason Segel, Anna Faris, Far East Movement

Drew Barrymore, Blake Shelton

Coming soon.Christina Aguilera, Kevin Smith, Melanie Fiona featuring J. Cole..

Jimmy Fallon, H.L. McCullough, Toby Keith

Taylor Swift, Michael Clarke Duncan, Cesar & David of Los Lobos, Robert Randolph, Chris Layton

Channing Tatum, Drew Brees, Meat Loaf

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, Andy Cohen, 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

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

Andy Samberg, Seth MacFarlane, Joe Henry featuring Lisa Hannigan

Katy Perry, Needtobreathe

Chris Pine, Rachael Ray, Everclear

Louis C.K., Lolo Jones, Delta Rae

Matt LeBlanc, Sig Hansen & Keith Colburn, Robin Thicke

Mila Kunis, Jim Norton, Justin Bieber

Tyler Perry, Rhys Ifans, Keane

Andrew Garfield, Of Monsters And Men

Wanda Sykes, Rob Riggle, Kimbra

Zachary Levi, Bubba Watson, B.o.B.

Morgan Freeman, \"Britain\'s Got Talent\" winners Ashleigh & Pudsey, Jana Kramer

Denis Leary, Olivia Munn, Kenny Chesney

Dana Carvey, Nicki Minaj

Charlie Sheen

Kate Beckinsale, Adam Carolla

Newt Gingrich, Nicole \"Snooki\" Polizzi, MGK

Rachel Weisz, Aaron Paul

Ben Stiller, Rose Byrne, Missy Higgins

Vince Vaughn, Travis Pastrana, Aretha Franklin

Colin Farrell, Jenni \"JWoww\" Farley, Jay Sean

Jessica Biel, Kevin Smith, the Lumineers

Julie Scardina, Dwyane Wade, MoZella

Jeremy Renner, Betty White, Joss Stone

Jay interviews special guest, First Lady Michelle Obama & Norah Jones performs.

Jay interviews Kelsey Grammer.

Sylvester Stallone talks about his new movie, “The Expendables 2”

Jay interviews Kristen Bell & Regina Spektor performs.

Jason Statham talks about his new movie “The Expendables 2”

Maya Rudolph, Jeff Foxworthy, Morning Parade

Shia LaBeouf, Jean-Claude Van Damme, fun.

Katie Couric, Dax Shepard, Emeli Sande

Kirsten Dunst, Chris Matthews, Smashing Pumpkins

Howie Mandel, Alejandro Escovedo

Dennis Miller, Joshua Radin

Owl City with Carly Rae Jepsen

Bill Maher, Tristan Prettyman

Savannah Guthrie, Dolph Lundgren

Lauren Graham, Dan Patrick