S19 E1: Ron Howard, Nicole "Snooki" Polizzi, Sick Puppies

S19 E2: Queen Latifah, Gustavo Dudamel, Jazmine Sullivan

S19 E3: Jamie Foxx, Leighton Meester

S19 E4: Hilary Swank, Jesse Eisenberg, Los Lobos

S19 E5: Jim Parsons, Hailee Steinfeld, Lukas Nelson

S19 E6: Randy Jackson, Jennifer Lopez, Ryan Seacrest, Steven Tyler, Dan Ahdoot, Diane Birch

S19 E7: Bill Maher, Cam Newton, the Duke Spirit

S19 E8: Seth Rogen, Brady Barr, Bettye Lavette

S19 E9: Cameron Diaz, Eric Stonestreet, the Civil Wars

S19 E10: Michael Douglas, Julie Scardina, Randy Rogers Band

S19 E11: Gordan Ramsay, Kathleen Madigan, Maroon 5

S19 E12: Ashton Kutcher, Aubrey Plaza, Neon Trees

S19 E13: Amy Poehler, Mike "The Situation" Sorrentino, Grace Potter & the Nocturnals

S19 E14: Ben Affleck, the Decemberists

S19 E15: Kathie Lee Gifford & Hoda Kotb, Armie Hammer, Hayes Carll

S19 E16: Dana Carvey, Maggie Q, Lizz Wright

S19 E17: Jason Statham, Melissa McCarthy, White Lies

S19 E18: Annette Bening, Frank Caliendo, Amos Lee

S19 E19: Kathy Bates, Brad Womack, Billy Currington

S19 E20: Justin Bieber, Jay Mohr, the Band Perry

S19 E21: Adam Sandler, Larry the Cable Guy, Esperanza Spalding

S19 E22: Helena Bonham Carter, Timothy Olyphant, One eskimO

S19 E23: Jesse Eisenberg, Jennifer Lawrence, Ryan Bingham

S19 E24: Jeff Bridges, Dianna Agron, Bobby Long

S19 E25: Hugh Laurie, Hailee Steinfeld, Finesse Mitchell

S19 E26: Mark Wahlberg, Lachlan Patterson, James Blunt

S19 E27: Javier Bardem, Paula Abdul, Merle Haggard

S19 E28: Matt LeBlanc, Clay Matthews, Ricky Martin

S19 E29: Rob Lowe, Amber Riley, Nicki Minaj

S19 E30: Kathy Griffin, Gayle King, the Black Keys

S19 E31: Lady Gaga, Sofia Vergara, John Legend

S19 E32: Liam Neeson, Dave Salmoni, Gretchen Wilson

S19 E33: Charles Barkley, Jenni "JWoww" Farley, Red

S19 E34: Jenna Fischer, Abigail Breslin, Miguel

S19 E35: Mark Harmon, Dwight Howard, 30 Seconds to Mars

S19 E36: The Tonight Show with Jay Leno Season 19 Episode 36

S19 E37: Owen Wilson, Rachel Maddow, Anberlin

S19 E38: Randy Jackson, Nick Swardson, Travie McCoy

S19 E39: Meredith Vieira, DJ Pauly D, Hanson

S19 E40: Emily Blunt, Jackson Murphy, Chris Medina

S19 E41: Christina Appelgate, John Fulton, Michael Franti

S19 E42: Matt Damon, Betty White, Cake

S19 E43: Simon Cowell, Jeff Gordon, Travis Barker

S19 E44: Jerry Seinfeld, Bailee Madison, Darlene Love

S19 E45: Aaron Eckhart, Christie Brinkley, Thompson Square

S19 E46: Jane Lynch, Chris Matthews, Avril Lavigne

S19 E47: Wanda Sykes, Simon Pegg, Juanes

S19 E48: Matthew McConaughey, Rizwan Manji, Michael Kosta

S19 E49: Rainn Wilson, "Epic Meal Time" with Harley Morenstein & Sterling Toth, Serj Tankian

S19 E50: Robert Pattinson, Whitney Cummings, Alice Cooper

S19 E51: Zachary Levi, Lisa Lampanelli, Raphael Saadiq

S19 E52: Julie Scardina, Rebecca Black, Duran Duran

S19 E53: Carol Burnett, Jason Ritter, Keith Urban

S19 E54: Kirstie Alley, Jon "Bones" Jones, Peter, Bjorn & John

S19 E55: Jennifer Hudson, William H. Macy

S19 E56: Russell Brand, Lorraine Nicholson, Los Lonely Boys

S19 E57: Howie Mandel, Zachary Gordon, Dierks Bentley

S19 E58: Helen Hunt, Sammy Hagar, Good Charlotte

S19 E59: Kourtney & Kim Kardashian, Fareed Zakaria, Mary Mary

S19 E60: Vin Diesel, Ashley Tisdale, Scissor Sisters

S19 E61: Tracy Morgan, Neve Campbell, Augustana

S19 E62: Dwayne Johnson, Bethany Hamilton, Fitz & the Tantrums

S19 E63: Matthew Morrison, Carrie Underwood

S19 E64: Emma Roberts, Gary Busey, Jeff Beck with Imelda May

S19 E65: David Arquette, Ben Bailey, Far East Movement

S19 E66: Jamie Foxx, k.d. lang

S19 E67: Kristen Bell, Austin "Chumlee" Russell

S19 E68: Jessie J

S19 E69: Tyler Perry, Kendra Wilkinson, Bright Eyes

S19 E70: John Travolta, Eliza Doolittle

S19 E71: Christina Aguilera, Paul Reiser, Alison Krauss & Union Station featuring Jerry Douglas

S19 E72: Lindsay Lohan, Jillian Michaels, the Airborne Toxic Event

S19 E73: Rene Russo, Kevin Hart, Buddy Guy

S19 E74: Chelsea Handler, Judd Apatow, OK Go

S19 E75: Rob Lowe, Moby

S19 E76: Paul Walker, Donny & Marie Osmond

S19 E77: Penelope Cruz, Ricky Martin

S19 E78: Kate Hudson, Chris Hemsworth, Sergio Mendes with Siedah Garrett

S19 E79: Wanda Sykes, Ralph Macchio, Priscilla Ahn

S19 E80: Steven Tyler, Aubrey Plaza, the Civil Wars

S19 E81: Jennifer Lopez, Chris Colfer, BC Jean

S19 E82: Julie Scardina, Ginnifer Goodwin, Def Leppard

S19 E83: Dick Van Dyke, Khloe Kardashian & Lamar Odom, Steve Earle

S19 E84: Norm Macdonald

S19 E85: Jodie Foster, Ken Jeong, Rodrigo y Gabriela

S19 E86: Eva Mendes, storm chaser Reed Timmer, Tedeschi Trucks Band

S19 E87: Ryan Seacrest, Jordana Brewster, TV on the Radio

S19 E88: Ed Helms, Chelsea Kane, Iron & Wine

S19 E89: Jack Black, Mike Huckabee, Parachute

S19 E90: Kirstie Alley, Erik Rivera, Il Volo

S19 E91: Dustin Hoffman, Meghan McCain, the Script

S19 E92: Meredith Vieira, Demetri Martin, Ben Harper

S19 E93: Chaz Bono, Brady Barr, Foster the People

S19 E94: Piers Morgan, Rico Rodriguez, Scott Weiland

S19 E95: Paris Hilton, Dhani Jones, INXS with Pat Monahan

S19 E96: Katie Couric, Cee-Lo Green

S19 E97: Kevin Bacon, Bethenny Frankel, OneRepublic

S19 E98: Jada Pinkett Smith, Elle Fanning, Lenka

S19 E99: Jim Carrey, Selena Gomez, Tinie Tempah

S19 E100: Bill Cosby, Kris & Bruce Jenner, Neon Trees

S19 E101: Adam Levine, Ziggy Marley

S19 E102: Kim Kardashian, Lior Suchard, Randy Travis with Josh Turner

S19 E103: Blake Lively, Blake Shelton, Scotty McCreery

S19 E104: Larry David, Pitbull with Ne-Yo

S19 E105: Josh Duhamel, Jill Scott

S19 E106: Bono & the Edge, Larry the Cable Guy, a performance from

S19 E107: Rosario Dawson, Marc Anthony, Jackie Evancho

S19 E108: Louis C.K., Richard Engel, Raphael Saadiq

S19 E109: Justin Timberlake, Kevin Hart, the Antlers

S19 E110: David Spade, Tom Papa, Plain White T's

S19 E111: Jim Carrey, Selena Gomez, Tinie Tempah

S19 E112: Blake Lively, Blake Shelton, Scotty McCreery

S19 E113: Larry David, Ashley Hebert, Pitbull featuring Ne-Yo

S19 E114: Kirstie Alley, Comic Erik Rivera

S19 E115: Lisa Kudrow, Billy Gardell, Natasha Bedingfield

S19 E116: Julie Scardina; Mary-Louise Parker; Billy Ray Cyrus

S19 E117: Kevin James, The Voice winner Javier Colon

S19 E118: Kathie Lee Gifford, Hoda Kotb, Ashton Shepherd

S19 E119: Howie Mandel, David Feherty, Joss Stone

S19 E120: Seth Meyers, Marjorie Johnson, Barry Manilow

S19 E121: Craig Ferguson, Rose Byrne

S19 E122: Don Rickles, Bristol Palin, Colbie Caillat

S19 E123: Bryan Cranston, Nancy Grace, Shaggy

S19 E124: Neil Patrick Harris, Buddy Valastro, Imelda May

S19 E125: Jenna Fischer, Ben Bailey, 3 Doors Down

S19 E126: Daniel Craig, Gavin DeGraw

S19 E127: Emma Stone, Adam Carolla, Rickey Minor, Grace Potter, Charles Bradley, Sharon Jones

S19 E128: Dolly Parton, Ben Bailey

S19 E129: Jessica Alba, Sue Johanson, Gomez

S19 E130: Shaun White, Olivia Wilde, Train

S19 E131: Chris Tucker, Skipper Bivins & Trent Jackson, Vanessa Carlton

S19 E132: Matt LeBlanc, Freida Pinto, Stevie Nicks

S19 E133: Gillian Anderson, Aziz Ansari, Kelly Rowland

S19 E134: Ryan Reynolds, Sheryl Crow, Matt Nathanson

S19 E135: Katie Holmes, Novak Djokovic, Mat Kearney

S19 E136: Jeremy Piven, Kelly Osbourne

S19 E137: Roseanne Barr, Jason Momoa, Lykke Li

S19 E138: Dennis Miller, Dennis Rodman, Rye Rye featuring Robyn

S19 E139: Gordon Ramsay, Bryce Dallas Howard, Panic! at the Disco

S19 E140: Jesse Eisenberg, Mike ''The Situation'' Sorrentino

S19 E141: Joel McHale, Viola Davis, Ximena Sarinana

S19 E142: Sam Worthington, Bailee Madison, The Game

S19 E143: Jane Fonda, Elizabeth Banks, Mana

S19 E144: Julie Scardina, David Koechner, Cake

S19 E145: Jeff Bridges, Nicole

S19 E146: Allison Janney, Jay Mohr, OK Go

S19 E147: Heidi Klum, Kevin Smith, Fitz and the Tantrums

S19 E148: Dick Cheney, Carrot Top, Andy Grammer

S19 E149: Wanda Sykes, Nick Swardson, Roger Daltrey

S19 E150: Kristin Chenoweth, Chris Colfer

S19 E151: Will Arnett, Tinie Tempah

S19 E152: Bill Maher, Octavia Spencer, Alice Cooper

S19 E153: Christina Applegate, Pauly D, Glen Campbell

S19 E154: Ellen DeGeneres, Bob Harper, Cobra Starship

S19 E155: Jane Lynch, Demetri Martin, Needtobreathe

S19 E156: Kevin Hart, Charlie Sheen, LMFAO

S19 E157: Jason Statham, Michele Bachmann, Lady Antebellum

S19 E158: Simon Cowell, Natasha Leggero, Selena Gomez

S19 E159: Gerard Butler, Whitney Cummings, Kelly Clarkson

S19 E160: Amy Poehler, Joseph Gordon-Levitt, the Kooks

S19 E161: Jamie Foxx, Michelle Monaghan, Bush

S19 E162: Hugh Jackman, Maya Rudolph, Tony Bennett

S19 E163: Ryan Gosling, Pauley Perrette, Arctic Monkeys

S19 E164: Lauren Graham, Seth MacFarlane

S19 E165: Ed Helms, Lisa Hannigan

S19 E166: Albert Brooks, Deena Nicole Coretese, TV on the Radio

S19 E167: Hugh Laurie, Chaz Bono, the Airborne Toxic Event

S19 E168: Evangeline Lilly, Magic Johnson, Jo Koy

S19 E169: Kim Kardashian, Kris Humphries, Kenny Wormald, LeAnn Rimes

S19 E170: Tim Allen, Theresa Caputo, Scotty McCreery

S19 E171: Jack Black, Steve Martin, Owen Wilson, Aubrey Plaza, Blondie

S19 E172: David Arquette, Darrell & Brandon Sheets, Puddle of Mudd

S19 E173: Aaron Eckhart, Julianne Hough, Amos Lee

S19 E174: Julie Bowen, Dave Salmoni, Imelda May

S19 E175: Zooey Deschanel, J.R. Martinez, Fountains of Wayne

S19 E176: Zachary Levi, Gloria Estefan

S19 E177: Terry Bradshaw, Rowan Atkinson, Game

S19 E178: Jonah Hill, Paula Deen, Chris Isaak

S19 E179: President Barack Obama

S19 E180: Amanda Seyfried, John Cho & Kal Penn, Patrick Stump

S19 E181: Chelsea Handler, Chris D'Elia, the Original 7ven

S19 E182: Adam Sandler, Drew Manning, Awolnation

S19 E183: Justin Bieber, David Freese, Lloyd

S19 E184: Eddie Murphy, Robyn

S19 E185: Taylor Lautner, Martha Stewart, Daughtry

S19 E186: Kristen Stewart, Dave Attell, Joe Jonas

S19 E187: Miss Piggy, Mickey Rourke, Mute Math

S19 E188: Ellen Barkin, Henry Cavill, Cirque du Soleil

S19 E189: Jason Segel, Kris Jenner, Lyle Lovett

S19 E190: Kelsey Grammer, Andrea Bocelli

S19 E191: Whitney Cummings, Chris Matthews, Il Divo

S19 E192: Kermit the Frog, Ricki Lake

S19 E193: Amy Adams, Rocket City Rednecks, Miranda Lambert

S19 E194: Howie Mandel, Nicole "Snooki" Polizzi, Patrick Stump

S19 E195: Robin Williams, Vince Gill

S19 E196: Jimmy Fallon, Drew Brees, Gym Class Heroes

S19 E197: Jim Parsons, Meghan McCain, Tom Morello with Ben Harper

S19 E198: Dennis Miller, David & Sean La Vau, Javier Colon

S19 E199: Julie Scardina, Dane Cook, Hot Chelle Rae

S19 E200: Chelsea Handler, Dwight Howard, Gloriana

S19 E201: Damon Wayans Jr., She & Him

S19 E202: Kathy Bates, Jay Mohr, Switchfoot

S19 E203: Bill Cosby, Raini Rodriguez, Iron & Wine

S19 E204: Melissa McCarthy, Gov. Rick Perry, T-Pain

S19 E205: Hilary Swank, Mike 'The Situation' Sorrentino, Dia Frampton'

S19 E206: Robert Downey Jr., Abigail Breslin, Alison Krauss & Union Station

S19 E207: Katherine Heigl, J.B. Smoove, Taio Cruz

S19 E208: Lea Michele, Adam Carolla, Neil Diamond

S19 E209: Katie Couric, Chris D'Elia, Blake Shelton

S19 E210: Bill O'Reilly, Jackie Evancho

S19 E211: Charlize Theron, Kevin Hart, Foster the People

S19 E212: Dana Carvey, Jason Reitman, Lenny Kravitz

S19 E213: Louis C.K., Common

S19 E214: Al Michaels & Cris Collinsworth, Elle Fanning, Robin Thicke

S19 E215: Rep. Ron Paul, Chris Cornell

S19 E216: Sandra Bullock, Diablo Cody, Pink Martini

S19 E217: Charles Barkley, Berenice Bejo, Amber Riley

S19 E218: Thomas Haden Church,

S19 E219: Jonah Hill, Chris Paul, Il Volo

S19 E220: Terry Bradshaw, Bailee Madison, Chris Isaak