Season 4

Alice Eve, Mark Duplass, Wyatt Cenac, Dorothy

Rob Corddry, Paula Abdul

Blake Griffin, Paul Feig, Demetri Martin

Cher, William H. Macy

Rob Lowe, Leighton Meester, Poppy

Joe Manganiello, Jennifer Love Hewitt, Why Don't We

Allison Brie, Keegan-Michael Key, Prof. Robert Winston

Mel B, Dr. Phil McGraw, Olivia Munn, Good Charlotte

Tracey Ullman, Henry Golding, Madison Beer

Kaley Cuoco, Joel McHale, Gaz Coombes

Joan Collins, Johnny Galecki, Badflower

Tiffany Haddish, Jay Hernandez, Tori Kelly

Rupert Everett, Rob Riggle, Ben Howard

Max Greenfield, Sophie Turner, Josh Groban

Damon Wayans Jr., Gina Rodriguez, Mark Normand

Chris Sullivan, Lil Rel Howery, Sabrina Carpenter

Riz Ahmed, Mary Elizabeth Winstead, Phosphorescent

Actor Riz Ahmed (Venom (2018)); actress Mary Elizabeth Winstead (All About Nina (2018)); Phosphorescent perform.

Jeff Bridges, Jenny Slate, Arctic Monkeys

Beth Behrs, Taran Killam, Boy George

Jon Hamm, Judy Greer

Keira Knightley, Kathryn Hahn, Joe Zimmerman

Jamie Lee Curtis, Felix Mallard, Colin Macleod

Maya Rudolph, Nick Kroll, Rufus Wainwright

Dakota Johnson, Gordon Ramsay, Mike Posner

Jamie Dornan, Florence Welch, Florence + The Machine

Rosamund Pike, Zlatan Ibrahimovic, Snow Patrol

Amber Stevens West, Randall Park, Lenny Kravitz

Carey Mulligan, Jenna Fischer

Greg Kinnear, Katie Hill, Ariana Grande

Actor Greg Kinnear ("House of Cards"); congressional candidate Katie Hill; singer/songwriter Ariana Grande;

Adam DeVine, Dan Stevens, KISS

Rami Malek, Joel Edgerton, Mike Shinoda, Barbra Streisand

Aaron Taylor-Johnson, Richard Madden, KISS, Snow Patrol

Busy Philipps, Noah Centineo, Derren Brown, Morrissey

Zoe Kazan, Jack Whitehall, Chloe x Halle

Octavia Spencer, Jesse Williams, Pentatonix

Justin Hartley, Dominic West, Elle King, Migos

Melissa McCarthy, Richard E. Grant, Mark Wahlberg, Ian Karmel

Maggie Gyllenhaal, Paul Dano, Diego Luna, Dylan Reynolds

Kurt Russell, Viggo Mortensen, Marc E. Bassy ft. G-Eazy

Eric Bana, Billie Lourd, Emily Heller

Michael B. Jordan, Linda Cardellini, Eddie Redmayne, Death Cab for Cutie

Michael Peña, Andy Serkis, Lauv & Julia Michaels

Kermit the Frog, Minka Kelly, Peter Krause, Sampha

Sara Gilbert, Jeff Goldblum

Zachary Levi, Jake Johnson

Jude Law, Steve Coogan, Sam Morril

Jennifer Aniston, Dolly Parton, Leon Bridges

Sean Hayes, Ice Cube

Ellen DeGeneres, Patrick Wilson

Gisele Bündchen, Janelle Monáe, Katherine Ryan

Julia Roberts, Jason Momoa, Yahya Abdul-Mateen II, She & Him

Armie Hammer, Amber Heard, Middle Kids, Cardi B

Pharrell Williams, Gwen Stefani, Lin-Manuel Miranda, Emily Blunt

Jennifer Lopez, Leah Remini, Black Eyed Peas

Will Ferrell, RuPaul Charles

KiKi Layne, John David Washington, Alec Benjamin

Ken Jeong, Brian Tyree Henry, H.E.R.

Amy Adams, Tyler Perry, Mekki Leeper

James welcomes actress Amy Adams, actor Tyler Perry, and comic Mekki Leeper.

Cedric the Entertainer, Ashley Graham, Flatbush Zombies

Claire Foy, Andie MacDowell, Freya Ridings

Nina Dobrev, Terry Crews, Jack & Jack

Cobie Smulders, Sebastian Stan, Joel Kim Booster

Vanessa Hudgens, Andrew Rannells

Russell Wilson, Chris Pratt, Elizabeth Banks, Will Arnett

Stephen Curry, Regina King, Ron Funches, Lauren Jauregui

Sonequa Martin-Green, Pete Holmes, Rebecca Ferguson, Ava Max

Neil Patrick Harris, Chelsea Peretti, Adam Newman

Eric McCormack, Danielle Macdonald, Paige Weldon

Regina Hall, Eugene Levy, Charlie Day

Kevin Hart, Stephen James, Phosphorescent

Laura Dern, Alfonso Cuarón, Beck

Billy Crystal, Sarah Chalke, Buddy

Alicia Keys, Hailey Bieber, Joe List

Matt LeBlanc, Will Arnett, Broods

Kelsey Grammer, Jay Baruchel, Alessia Cara

Rebel Wilson, Priyanka Chopra Jonas, Justin Flom

Courteney Cox, Nick Kroll, Betty Who

Ray Romano, D'Arcy Carden, Lukas Graham

Mahershala Ali, Aaron Sorkin, Julia Michaels & Niall Horan

Elizabeth Warren, 50 Cent, TNT Boys

Kate Walsh, Stephen Merchant, Natalie Prass

Kal Penn, Chris O'Dowd, Adam Ferrara

Nick Jonas, Joe Jonas, Kevin Jonas, Lior Suchard

Isla Fisher, Chiwetel Ejiofor, Jonas Brothers

Allison Janney, Samuel L. Jackson, Jonas Brothers

Cole Sprouse, Dan Levy, Jonas Brothers

Rita Wilson, Kevin Nealon, Jason Mitchell

Gordon Ramsay, Piper Perabo, Elle King

Sharon Osbourne, Sam Richardson, Ryan Conner

Kate Beckinsale, Milo Ventimiglia, Better Oblivion Community Center

Adam Scott, Taron Egerton, Miles Kane

Ben Schwartz, Tim Roth, Leon Bridges

David Boreanaz, Cam Newton, Daddy Yankee

Max Greenfield, Maggie Siff

Kobe Bryant, Cara Delevingne, Tom Walker

Pamela Adlon, David Harbour, Wallows

Pamela Adlon; and David Harbour. Also: Wallows perform.

Rachel Bloom, Christopher Meloni, Rita Wilson

Zach Braff, Ben Platt

Zach Braff. Also: Ben Platt performs.

Colin Farrell, Woody Harrelson

Matthew McConaughey, Reba McEntire, Jimmy Buffett

Bill Hader, Anna Chlumsky, Ally Brooke, Tyga

Zoe Saldana, Jason Clarke, Kenny DeForest

Nikolaj Coster-Waldau, Sara Bareilles

Karlie Kloss, Max Minghella, Sean Paul + J Balvin

Rob Lowe, Elle Fanning, Blood Orange

Seth MacFarlane, Linda Cardellini, The 1975

Andrew Garfield, Lake Bell, BLACKPINK

Dax Shepard, Jodie Comer, Paul Rudd, Avril Lavigne

Topher Grace, Jason Schwartzman, Chad Daniels

Dr. Phil, Timothy Simons, Ashley Tisdale

Anna Faris, Kunal Nayyar, Shaggy

Charlize Theron, Seth Rogen, Lauren Jauregui

Chelsea Handler, Ginnifer Goodwin, Tom Odell

Christina Applegate, Kenneth Branagh, Rival Sons

Anne Hathaway, Rebel Wilson, Andy Sandford

Lisa Kudrow, Will Forte, Jason Sudeikis, Sarah Tollemache

Lily Collins, Charles Melton, NCT 127

Octavia Spencer, Henry Winkler

Halle Berry, Anjelica Huston, Allison Williams, Carly Rae Jepsen

Renée Zellweger, Ben Kingsley, Oliver Tree

Jessica Alba, Gabrielle Union, Josh Gondelman

Jessica Alba; and Gabrielle Union. Also: stand-up comedy from Josh Gondelman.

Elizabeth Banks, Bradley Whitford, David Tennant, Billy Ray Cyrus

Lucy Liu, James Marsden

Mark Hamill, Bradley Whitford, Lewis Capaldi

Mindy Kaling, Adam Scott, Lewis Capaldi

Tiffany Haddish, Don Cheadle, Keane

Tom Hanks, Gillian Anderson, David Blaine, Michelle Obama

Lily James, Millie Bobby Brown, Little Mix

Ian McKellen, Louis Tomlinson, Simon Pegg

Michael Sheen, Paul Giamatti, Mumford & Sons, Cast of X-Men Dark Phoenix

Paul Scheer, Stana Katic, The 1975

Eva Longoria, Thomas Lennon

Sutton Foster, Eddie Izzard, Dave Ross

Keegan-Michael Key, Terry Crews, Joshua Jay

Jeff Goldblum, Andie MacDowell, Bishop Briggs

John Legend, Mandy Moore, Hollywood Vampires

Patricia Arquette, Michael Peña, Freya Ridings

Jamie Bell, Margaret Qualley, Freya Ridings

Domhnall Gleeson, Pete Holmes, Aldis Hodge, Machine Gun Kelly, Yungblud

Melissa McCarthy, Elisabeth Moss, Jakob Dylan, Jade Castrinos

Joel McHale, Betty Gilpin

Ron Burgundy, Josh Gad, Michaela Watkins

Greg Kinnear, Judy Greer, Bazzi

RuPaul Charles, David Oyelowo, Alfie Allen

Anthony Anderson, Jared Harris, Smokey Robinson, Christian Finnegan

Michael Douglas, Nicole Byer