Sam Champion, Bradley Cooper, Rick Schwartz

Nick Lachey, Tim Gunn, Shia LaBeouf

Chris Harrison, Jordin Sparks, Greg Yapalater

Carrie Ann Inaba, Larry Hagman, Lisa Kudrow

Nick Lachey, Amy Adams, Arthur Agatston, Marilu Henner, Vanessa Williams

Nick Lachey, Joey Fatone, Dr. Joel Fuhrman, Caroline Rhea

Nick Lachey, Carson Kressley, Mike Moreno, Joss Stone

Chris Harrison, Mark Hyman, Rachel Weisz

Chris Harrison, William Davis Jr., Zachary Gordon, Jeremy Renner

Joel McHale, Skipper Bivins, Trent Jackson, Olivia Munn, Lou Diamond Phillips

Joel McHale, Josh Henderson, Dylan McDermott

Joel McHale, Zach Galifianakis, John Rich

Michael Buckley, Will Ferrell, Jef Holm, Emily Maynard, Andrew Zimmern

Mark Consuelos, The Situation, Vince Vaughn

Rob Thomas, Carla Gugino, John Stamos

Jerry O'Connell, Heidi Klum

Markette Smith, Josh Groban, Victor Cruz, Jesse Metcalfe

Markette Smith, Josh Groban, Jenni Farley, Snooki, Gary Oldman

Markette Smith, Josh Groban, Kristin Davis

Seth Myers, Kristen Johnston, Ray Romano, Lawrence Zarian

Seth Myers, Anne Hathaway, John Leguizamo, Lawrence Zarian

Seth Myers, Glenn Close, Elijah Wood, Lawrence Zarian

Seth Myers, Matt Bomer, Allison Williams, Lawrence Zarian

Seth Myers, Eric McCormack, Kyra Sedgwick, Lawrence Zarian

Mark Feuerstein, Rose Byrne, Caroline Manzo

Carrie Ann Inaba, Salma Hayek, Rhys Ifans

Kevin Jonas, Blake Lively, Cody Simpson

Michael Strahan, Martin Sheen, Eva Simons, John Travolta, Will.i.am

Michael Strahan, Sally Field

Michael Strahan, Ashanti, Sonya FItzpatrick, Matthew McConaughey

Michael Strahan, Carly Rae Jepsen, Char Margolis, Channing Tatum

Michael Strahan, Theresa Caputo, Seth McFarlane, Emma Stone

Tyler Perry, Chris Bosh, Andrew Garfield, Joe Manganiello, Sylvia Browne

Carrie Ann Inaba, Andy Cohen, Chris Pine, Blues Traveler

Nick Lachey, Mary J. Blige, Cat Cora, Mark Feuerstein, Rita Wilson

Bryant Gumbel, Marc Forgione, Michelle Obama

Jerry O'Connell, Michael Ealy, Raven-Symoné, Ben Stiller

Jerry O'Connell, Bristol Palin, Noah Wyle

Andy Samberg, Patrick Duffy, Marilu Henner, Chris Rock

Neil Patrick Harris, Chris Byrne, Jessica Chastain, Emeli Sandé

Neil Patrick Harris, Chuck Cureau, Julianne Hough, Kerry Washington

Bryant Gumbel, Wendy Bazilian, Oliva Culpo, Jenny McCarthy

Bryant Gumbel, Cat Deeley, Gavin DeGraw, Snigdha Nandipati

Mike Greenberg, Chris Hemsworth, Joseph Lawrence

Mike Greenberg, Bill Hader, Kristen Stewart

Martin Short, Melissa Joan Hart, Joshua Ledet

Ed Robertson, Amy Brenneman, Jessica Sanchez

Mario López, Katie Brown, Corey Harrison, Rick Harrison, Jim Parsons, Chumlee

Seth Myers, Judith Light, Bill Paxton

Seth Myers, Kevin Costner, Katharine Jenkins, William Levy

Seth Myers, Josh Brolin, Donald Driver, Peta Murgatroyd

Antonio Reid, Kris Allen, Jimmy Fallon

Taye Diggs, Emily Maynard, Robin Thicke

Reggie Bush, Krysten Ritter, Tom Selleck

Chris Harrison, Christina Hendricks, Derek Hough, Maria Menounos

Chris Harrison, Eli Manning, Billy Bob Thornton

Sam Champion, LL Cool J, James Morrison

Jimmy Kimmel, Hollie Cavanagh, Chris Colfer

Nick Lachey, Felicity Huffman, Kip Moore

Nick Lachey, Roshon Fegan, Ginnifer Goodwin, Chelsie Hightower

Michael Strahan, Chace Crawford, Karmin

Michael Strahan, Stephen Colbert

Michael Strahan, Cameron Diaz, Skylar Laine

Ben Mulroney, Nathan Fillion, Aaron Sanchez, William Polly

Josh Groban, Beth Behrs, Sissy Spacek

Josh Groban, Jeremy Britt, Lisa Rinna, Mark Ruffalo

Pat Kiernan, Daniel Dae Kim, Corinne McCormack, Samantha Ronson

Pat Kiernan, Elise Testone, Donald Trump, Annelise Hagen

Mark Consuelos, Maggie Q, Chris Daughtry

Matthew Broderick, Mark Ballas, Jenna Fischer, Katherine Jenkins, Garry Marshall

Mario López, Ashanti, Kathleen Turner, James Van Der Beek

Jesse Palmer, Hugh Grant, Blair Underwood

Jesse Palmer, Colton Dixon, Kate Walsh

Seth Myers, Candice Bergen, Peter Gros, Eva La Rue

Seth Myers, Gavin DeGraw, Zac Efron, Ana Gasteyer

Mike Greenberg, Kevin Hart, Science Bob, Olivia Wilde

D.L. Hughley, Jane Goodall, Julia Louis-Dreyfus, Ron Wood

D.L. Hughley, Ice-T, Paul Wesley

Joel McHale, Martha Plimpton, John Slattery, Twist

Joel McHale, Laura Linney, Chrissie Miller, Bradley Whitford

Carson Kressley, Monica Arnold, DJ Cassidy, Cheryl Hines, Brandy Norwood

Howie Mandel, Christina Applegate, Pauly D, Gabourey Sidibe

Howie Mandel, DeAndre Brackensick, L.A. Reid, Sofia Vergara, Samantha Ronson

Ben Mulroney, David James Elliott, Martin Luthi

Peter Facinelli, Melanie Fiona, Johnny Galecki

Chris Harrison, Jayma Mays, Caroline Rhea, Far East Movement

Mark Consuelos, Jason Biggs, Heejun Han

Jerry O'Connell, Lily Collins, Kate Winslet

Jerry O'Connell

Michael Strahan, Sarah Michelle Gellar, Vanessa Hudgens, Denzel Washington, Michael Weatherly

Martin Short, Josh Duhamel

Dana Carvey, Carla Gugino, Elizabeth Hurley, Ewan McGregor, Christina Ricci

Nick Lachey, Joan Collins, Jennifer Goldstein, Ice Cube

Michael Strahan, John Larroquette, Mary McCormack

Michael Strahan, Whitney Cummings, Ashley Judd

Michael Strahan, Susan Sarandon, Jeremy Sisto

Mark Consuelos, Lorraine Bracco, Will Ferrell, Elle Macpherson, Lindzi Cox, Art Moore, Tony Sirico

Kyle MacLachlan, Cee-Lo, Nicole Richie, Jeremy Rosado

Martin Short, Kathy Bates, Lorraine Bracco, Michael Consuelos, Art Moore, Tony Sirico, Big Time Rush

Martin Short, Katie Brown, Ewan McGregor

Pat Kiernan, Leslie Bibb, Willem Dafoe, Carley Roney

Nick Lachey, Fran Drescher, Chris Paul, Stephen Fanuka

Nick Lachey, Kristin Davis, Alison Sweeney, Kristin Van Ostrop

Peter Facinelli, Johnny Galecki

Dan Abrams, Anjelica Huston, Donnie Wahlberg

Dan Abrams, Don Cheadle, Ben McKenzie

Alec Baldwin, Taylor Kitsch, Larry the Cable Guy

Lucy Liu, Kristen Chenoweth, Poppy Montgomery

Mark Consuelos, Colbie Caillat, Carson Kressley

Mark Consuelos, Rico Rodriguez, Cobra Starship

Carrie Ann Inaba, Patricia Heaton, Carson Kressley

Matthew Morrison, Mark Consuelos, Jorge Garcia, Carson Kressley, Aureana Tseu

Daniel Dae Kim, Jon Cryer, Derek Hough, Carson Kressley

Josh Groban, Chris Byrne, Nicolas Cage, Carson Kressley

Josh Groban, Pauly D, Vinny Guadagnino, Ronnie Ortiz-Magro, Tracy Morgan

Tony Potts, Khloé Kardashian, Ricky Martin, Nicki Minaj

Randy Jackson, Christina Perri, Idris Elba, Katherine Kallnis, Sophie LaMontagne

Randy Jackson, Katharine McPhee, Reese Witherspoon

Jerry O'Connell, Dwayne Johnson, Rebecca Romijn

Jerry O'Connell, Deena Nicole Cortese, Sammi 'Sweetheart' Giancola, Ryan Reynolds

Michael Strahan, Vanessa Hudgens, Justin Tuck, Denzel Washington

Michael Strahan, Sarah Michelle Gellar, Michael Weatherly

Derek Hough, Sally Hogshead, Debra Messing, Atticus Shaffer

D.L. Hughley, Ashley Greene, Leo Laporte

Peter Facinelli, Jenni Farley, Snooki, Michelle Williams

Howie Mandel, Jennifer Lopez, Girls' Generation

Daniel Radcliffe, Carson Kressley, Rachel McAdams

Dan Abrams, Channing Tatum

Carrie Ann Inaba, Chelsea Handler, Andrea Arden

Cat Deeley, Nick Jonas, Rachael Ray

Kristen Chenoweth, Alan Cumming, Ingrid Michaelson, Emmy Rossum

Mary J. Blige, Chris Harrison, Cynthia Nixon

Kim Kardashian, Lucy Lawless, Kevin McHale, Peter Gros

Dana Carvey, Chris Grundy, Carla Gugino

Dana Carvey, Elizabeth Banks, Ewan McGregor

Mario López, Mark Feuerstein, Marg Heigenberger

Seth Myers, Jessica Alba, Matt Bomer

Seth Myers, Simon Baker, Kevin Hart

Apolo Ohno, Lana Parrilla, Common

Jesse Palmer, Miranda Cosgrove, Dolly Parton

Boomer Esiason, Dr. Melina Jampolis, Jane Krakowski, The Situation

Carl Edwards, Kate Beckinsale, Laura Prepon

Reggie Bush, Jorge Cruise, Mark Wahlberg

Rob Lowe, Kristen Bell, Jennifer Morrison, Melanie Amaro

Rob Lowe, Darren Criss, Vanessa Lachey

David Duchovny, Brooke Burke-Charvet, Terrence Howard

Jim Parsons, William H. Macy, Isaac Mizrahi

Mark Consuelos, Tyra Banks, Benjamin Flajnik

Josh Groban

Michael Strahan

Neil Patrick Harris

Mark Consuelos

Mark Consuelos

Andy Cohen

Seth Myers

Mark Consuelos, Joaquin Consuelos, Scarlett Johansson, The Radio City Rockettes, Mercer Boffey, Voca People

Mark Consuelos, Tyra Banks, Andy Cohen, Taye Diggs, Josh Groban, Neil Patrick Harris, Rooney Mara, Jerry O'Connell, Carley Roney, Michael Strahan

Michael Bublé, Daniel Craig

Michael Bublé, Robert Downey Jr., David Pogue, Lady Antebellum

Bryant Gumbel, Rachel Crow, Jude Law, John Rhode, Lawrence Zarian

Kevin Jonas, Matt Bean, Anthony Hamilton, Michelle Pfeiffer

Taye Diggs, Chris Byrne, Cindy Chiang, Ernie Halvorsen, David Hyde Pierce

Josh Groban, Jessica Biel, Anne Burrell

Josh Groban, Jessica Biel, Abigail Breslin, Anne Burrell, Cody Simpson, Michael Symon, Charlize Theron

Josh Groban, Andrew Carmellini, Zac Efron

Jonah Hill, Richard Blais, Sarah Jessica Parker, Emily VanCamp

Derek Hough, Paula Deen, Jeffrey Donovan, Elizabeth Olsen

Neil Patrick Harris, Matt Czuchry, Maya Rudolph

Neil Patrick Harris, Marcia Cross, Science Bob

Neil Patrick Harris, Kristen Johnston, Jaime Pressly, Hot Chelle Rae

Neil Patrick Harris, Molly Sims, Betty White, Cobra Starship & Sabi

Neil Patrick Harris, Angie Harmon, Avril Lavigne

Jerry O'Connell, Josh Capon, Nathan Fillion, Jane Lynch

Jerry Seinfeld, Miss Piggy, Howie Mandel, David Pogue

Jerry Seinfeld, Kim Cattrall, Jamie Oliver

Jerry Seinfeld, Jamie Oliver, Jason Segal