Actress Alice Eve; actor Mark Duplass; actor Wyatt Cenac; Dorothy performs;

Actor Rob Corddry; Paula Abdul talks and performs;

Professional basketball player Blake Griffin; director Paul Feig ("A Simple Favor"); comic Demetri Martin performs;

Actress Cher; actor William H. Macy;

Actor Rob Lowe ("The Bad Seed"); actress Leighton Meester ("Single Parents"); Poppy performs;

Actor Joe Manganiello; actress Jennifer Love Hewitt (9-1-1 (2018)); Why Don't We perform;

Actress Allison Brie ("GLOW"); actor Keegan-Michael Key; a science demonstration by Prof. Robert Winston;

Singer Mel B; TV personality Dr. Phil (Dr. Phil (2002)); actress Olivia Munn (The Predator (2018)); Good Charlotte perform;

Actress Tracey Ullman; actor Henry Golding ("A Simple Favor" and "Crazy Rich Asians"); Madison Beer performs;

Actress Kaley Cuoco (The Big Bang Theory (2007)); actor Joel McHale (The Happytime Murders (2018) and The Joel McHale Show with Joel McHale (2018)); Gaz Coombes performs;

Actress Joan Collins; actor Johnny Galecki ("The Big Bang Theory"); Badflower perform;

Actress Tiffany Haddish ("Night School"); actor Jay Hernandez ("Magnum P.I."); Tori Kelly performs;

Actor Rupert Everett (The Happy Prince (2018)); actor Rob Riggle; Ben Howard performs;

Actor Max Greenfield (The Neighborhood (2018)); actress Sophie Turner (Time Freak (2018)); Josh Groban (The Good Cop (2018)) talks and perform;

Actor Damon Wayans Jr. (Happy Together (2018)); actress Gina Rodriguez (Jane the Virgin (2014) and Smallfoot (2018)); comic Mark Normand performs;

Actor Chris Sullivan (This Is Us (2016)); actor Lil Rel Howery (Rel (2018)); Sabrina Carpenter performs;

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

Actor Jeff Bridges (Bad Times at the El Royale (2018)); comic Jenny Slate (Venom (2018)); Arctic Monkeys perform;

Actress Beth Behrs (The Neighborhood (2018)); actor Taran Killam (Night School (2018) and Single Parents (2018)); Boy George and Culture Club perform;

Actor Jon Hamm (Bad Times at the El Royale (2018)); actress Judy Greer (Kidding (2018));

Actress Keira Knightley (The Nutcracker and the Four Realms (2018)); actress Kathryn Hahn (Private Life (2018)); comic Joe Zimmerman;

Actress Jamie Lee Curtis ("Halloween"); actor Felix Mallard; Colin Mcleod performs;

Actress Maya Rudolph and actor Nick Kroll (Big Mouth (2017)); Rufus Wainwright performs.

Actress Dakota Johnson ("Bad Times at the El Royale"); chef Gordon Ramsay; Mike Posner performs;

Actor Jamie Dornan; singer Florence Welch; Florence and the Machine perform;

Actress Rosamund Pike (A Private War (2018)); soccer player Zlatan Ibrahimovic; Snow Patrol perform;

Actress Amber Stevens West (Happy Together (2018)); actor Randall Park (Fresh Off the Boat (2015)); Lenny Kravitz talks and performs;

Actress Carey Mulligan ("Wildlife" and "Collateral"); actress Jenna Fischer ("Splitting Up Together");

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

Actor Adam DeVine; actor Dan Stevens; KISS perform;

Actor Rami Malek ("Bohemian Rhapsody"); actor Joel Edgerton ("Boy Erased"); Mike Shinoda and K Flay perform; Carpool Karaoke with Barbra Streisand;

Actor Aaron Taylor-Johnson; actor Richard Madden; rock band Kiss; Snow Patrol perform;

Actress Busy Philipps (Camping (2018)); actor Noah Centineo ("Swiped); mentalist Derren Brown; Morrissey performs;

Actress Zoe Kazan ("The Deuce"); comic Jack Whitehall (The Nutcracker and the Four Realms (2018)); Chloe x Halle perform;

Actress Octavia Spencer ("Instant Family"); actor Jesse Williams ("Grey's Anatomy"); Pentatonix perform;

Actor Justin Hartley ("This Is Us"); actor Dominic West; Elle King performs; Carpool Karaoke with Migos;

Actress Melissa McCarthy and actor Richard E. Grant (Can You Ever Forgive Me? (2018)); actor Mark Wahlberg ("Instant Family"); comic Ian Karmel performs;

Actress Maggie Gyllenhaal; actor Paul Dano; actor Diego Luna; Dylan Reynolds performs;

Actor Kurt Russell (The Christmas Chronicles (2018)); actor Viggo Mortensen (Green Book (2018)); Marc E. Bassy and G-Eazy perform;

Actor Eric Bana ("Dirty John"); actress Billie Lourd ("American Horror Story"); comic Emily Heller;

Actor Michael B. Jordan (Creed II (2018)); actress Linda Cardellini (Green Book (2018)); actor Eddie Redmayne (Fantastic Beasts: The Crimes of Grindelwald (2018)); Death Cab for Cutie perform;

Actor Michael Pena; director Andy Serkis; Lauv and Julia Michaels perform;

Kermit the Frog; actress Minka Kelly (Titans (2018)); actor Peter Krause (9-1-1 (2018)); Sampha performs;

Jeff Goldblum talks and performs; actress Sara Gilbert ("The Connors" and "The Talk").

Actor Zachary Levi (Shazam! (2019)); actor Jake Johnson (Spider-Man: Into the Spider-Verse (2018));

Actor Jude Law (Vox Lux (2018)); actor Steve Coogan (Holmes & Watson (2018)); comic Sam Morril performs;

Actress Jennifer Aniston and singer Dolly Parton (Dumplin' (2018)); a performance by Leon Bridges.

Actor Sean Hayes (Will & Grace (1998)); Ice Cube talks and performs.

TV hostess Ellen DeGeneres (The Ellen DeGeneres Show (2003) and Ellen's Game of Games (2017)); actor Patrick Wilson (Aquaman (2018));

Model Gisele Bundchen; actress Janelle Monae;, a musical performance by Katherine Ryan.

Actress Julia Roberts (Ben Is Back (2018)); actors Jason Momoa and Yahya Abdul-Mateen II (Aquaman (2018)); a musical performance by She & Him;

Actor Armie Hammer (On the Basis of Sex (2018)); actress Amber Heard (Aquaman (2018)); a musical performance by Middle Kids; carpool karaoke with Cardi B.

Singer Pharrell Williams; Gwen Stefani talks and performs; composer Lin-Manuel Miranda and Emily Blunt (Mary Poppins Returns (2018));

Singer/actress Jennifer Lopez and actress Leah Remini (Second Act (2018)); a musical performance by The Black Eyed Peas.

Actor Will Ferrell (Holmes & Watson (2018)); TV personality RuPaul Charles (RuPaul's Drag Race (2009)); She & Him perform; Christmas Carpool Karaoke;

Actress Kiki Layne ("If Beale Street Could Talk"); actor John David Washington ("Ballers"); Alec Benjamin performs;

Actor Ken Jeong (The Masked Singer (2019)); actor Brian Tyree Henry (Spider-Man: Into the Spider-Verse (2018)); H.E.R. performs;

Actress Amy Adams ("Vice"); actor Tyler Perry; comic Mekki Leeper performs;

Actor Cedric the Entertainer; model Ashley Graham (American Beauty Star (2017)); Flatbush Zombies perform;

Actress Claire Foy; actress Andie MacDowell; Freya Ridings performs;

Actress Nina Dobrev (Fam (2019)); actor Terry Crews (America's Got Talent: The Champions (2019) and Brooklyn Nine-Nine (2013)); Jack & Jack perform;

Actress Cobie Smulders (Friends from College (2017)); actor Sebastian Stan; comic Joel Kim Booster performs;

Actress Vanessa Hudgens (Rent: Live (2019)); actor Andrew Rannells;

Professional football player Russell Wilson; actor Chris Pratt; actress Elizabeth Banks; actor Will Arnett;

Professional basketball player Stephen Curry; actress Regina King (If Beale Street Could Talk (2018) and Watchmen (2019)); actor Ron Funches; Lauren Jauregui performs;

Actress Sonequa Martin-Green (Star Trek: Discovery (2017)); actor Pete Holmes (Crashing (2017)); actress Rebecca Ferguson (The Kid Who Would Be King (2019) and Men in Black: International (2019)); Ava Max performs;

Actor Neil Patrick Harris (A Series of Unfortunate Events (2017)); actress Chelsea Peretti (Brooklyn Nine-Nine (2013)); comic Adam Newman performs;

Actor Eric McCormack (Will & Grace (1998)); actress Danielle Macdonald (Extracurricular Activities (2019) and Skin (2018)); comic Paige Weldon;

Actress Regina Hall (Black Monday (2019)); actor Eugene Levy (Schitt's Creek (2015)); actor Charlie Day (The Lego Movie 2: The Second Part (2019) and It's Always Sunny in Philadelphia (2005));

Actor Kevin Hart; actor Stephen James; (Phosphorescent) perform;

Actress Laura Dern; director Alfonso Cuaron; Beck performs;

Actor Billy Crystal; actress Sarah Chalke; Buddy performs;

Musician Alicia Keys; TV host Hailey Bieber; comic Joe List performs;

Actor Matt LeBlanc (Man with a Plan (2016)); actor Will Arnett (The Lego Movie 2: The Second Part (2019)); Broods perform;

Actor Kelsey Grammer (Proven Innocent (2019)); actor Jay Baruchel (How to Train Your Dragon: The Hidden World (2019)); Alessia Cara performs;

Actors Liam Hemsworth, Rebel Wilson, and Priyanka Chopra (Isn't It Romantic (2019));

Actress Courteney Cox; actor Nick Kroll; Betty Who performs;

Happy Valentine's Day; actor Ray Romano; actress D'Arcy Carden ("The Good Place"); Lukas Forchhammer perform;

Actor Mahershala Ali; playwright Aaron Sorkin; Julia Michaels and Niall Horan perform;

Sen. Elizabeth Warren (D-Mass); actor/rapper 50 Cent; TNT Boys perform;

Actress Kate Walsh ("The Umbrella Academy"); actor Stephen Merchant ("Fighting with My Family"); Natalie Prass performs;

Actor Kal Penn; actor Chris O'Dowd; comic Adam Ferrara;

Musicians Nick Jonas, Joe Jonas and Kevin Jonas; mentalist Lior Suchard;

Actress Isla Fisher; actor Chiwetel Ejiofor; Spill Your Guts or Fill Your Guts with The Jonas Brothers;

Actress Allison Janney (Mom (2013)); actor Samuel L. Jackson (Captain Marvel (2019)); comedy with The Jonas Brothers;

Actor Cole Sprouse (Riverdale (2017)); actor Dan Levy (Schitt's Creek (2015)); The Jonas Brothers perform;

Actress Rita Wilson; actor Kevin Nealon; actor Jason Mitchell;

Chef Gordon Ramsay; actress Piper Perabo ("Turn Up Charlie"); Elle King performs;

TV hostess Sharon Osbourne ("The Talk"); actor Sam Richardson; comic Ryan Conner performs;

Actress Kate Beckinsale (The Widow (2019)); actor Milo Ventimiglia (This Is Us (2016)). Also: band Better Oblivion Community Center performs.

Actor Adam Scott; actor Taron Egerton; Miles Kane performs;

Actor Ben Schwartz; actor Tim Roth; Leon Bridges performs;

Actor David Boreanaz (SEAL Team (2017)); professional football player Cam Newton; Daddy Yankee performs;

Actor Max Greenfield ("The Neighbor" and "What Men Want"); actress Maggie Siff ("Billions");

Retired professional basketball player Kobe Bryant; actress Cara Delevingne ("Life in a Year"); Tom Walker performs;

Actress Pamela Adlon ("Better Things"); actor David Harbour ("Stranger Things"); Wallows perform;

Actress Rachel Bloom (Crazy Ex-Girlfriend (2015)); actor Christopher Meloni (Happy! (2017)); Rita Wilson performs;

Actor Zach Braff; Ben Platt talks and performs;

Actor Colin Farrell ("Dumbo"); actor Woody Harrelson ("The Highwaymen"); actor Zachary Levi ("Shazam");

Actor Matthew McConaughey (The Beach Bum (2019)); country music artist Reba McEntire; musician Jimmy Buffett;

Actor Bill Hader ("Barry"); actress Anna Chlumsky ("Veep"); Ally Brooke and Tyga perform;

Actress Zoe Saldana ("Missing Link"); actor Jason Clarke ("Pet Sematary"); comic Kenny DeForest;

Actor Nicolaj Coster-Waldau ("Game of Thrones"); Sara Bareilles talks and performs;

Model Karlie Kloss; actor Max Minghella; Sean Paul and J Balvin perform;

Actor Rob Lowe; actress Elle Fanning ("Teen Spirit"); Blood Orange performs;

Actor Seth MacFarlane; actress Linda Cardellini (The Curse of La Llorona (2019)); The 1975 perform;

Actor Andrew Garfield (Under the Silver Lake (2018)); actress Lake Bell (Bless This Mess (2019)); Blackpink perform;

Actor Dax Shepard ("Bless This Mess"); actress Jodie Comer ("Killing Eve"); comedy with Paul Rudd; Avril Lavigne performs;

Actor Topher Grace; actor Jason Schwartzman; comic Chad Daniels;

Dr. Phil McGraw ("Dr. Phil"); actor Timothy Simons ("Veep"); Ashley Tisdale performs;

Actress Anna Faris ("Mom"); actor Kunal Nayyar ("The Big Bang Theory"); Shaggy performs;

Actress Charlize Theron and actor Seth Rogen ("Long Shot");

Actor Jamie Bell; comic Chelsea Handler; actress Ginnifer Goodwin (Point of Origin (2019)); Tom Odell performs;

Actress Christina Applegate ("Dead to Me"); actor Kenneth Branagh ("All Is True"); Rival Sons perform;

Actresses Anne Hathaway and Rebel Wilson ("The Hustle"); comic Andy Sandford performs;

Actors Lisa Kudrow, Will Forte, and Jason Sudekis (Booksmart (2019)); comic Sarah Tollemache performs;

Actress Lily Collins (Extremely Wicked, Shockingly Evil and Vile (2019) and Tolkien (2019)); actor Charles Melton (The Sun Is Also a Star (2019) and Riverdale (2017)); NCT 127 perform;

Actress Octavia Spencer ("Ma"); actor Henry Winkler ("Barry");

Actress Halle Berry and actress Anjelica Huston (John Wick: Chapter 3 - Parabellum (2019)); actress Allison Williams (The Perfection (2018) and Girls (2012)); Carly Rae Jepsen performs;

Actress Renee Zellweger (What/If (2019) and Judy (2019)); actor Ben Kingsley (Spider in the Web (2019)); Oliver Tree performs;

Actresses Jessica Alba and Gabrielle Union (L.A.'s Finest (2019)); comic Josh Gondelman performs;

Actress Elizabeth Banks ("Brightburn"); actor Bradley Whitford ("Godzilla"); actor David Tennant ("Good Omens"); Billy Ray Cyrus performs;

Actress Lucy Liu (Elementary (2012)); actor James Marsden (Once Upon a Time... in Hollywood (2019));

Actor Mark Hamill ("Child's Play"); actor Bradley Whitford ("The Handmaid's Tale" and "Godzilla: King of the Monsters"); Lewis Capaldi performs;

Actress Mindy Kaling (Late Night (2019)); actor Adam Scott (Big Little Lies (2017)); Lewis Capaldi performs;

Actress Tiffany Haddish (The Secret Life of Pets 2 (2019) and The Kitchen (2019)); actor Don Cheadle (Black Monday (2019)); Keane perform;

From London: actress Lily James (Yesterday (2019)); actress Millie Bobby Brown (Stranger Things (2016)); Little Mix perform;

From London: actor Ian McKellen; singer/songwriter Louis Tomlinson; actor Simon Pegg;

Actor Paul Scheer; actress Stana Katic; The 1975 perform;

Actress Eva Longoria; actor Thomas Lennon;

Actress Sutton Foster ("Younger"); actor Eddie Izzard ("Abominable"); comic Dave Ross;

Actor Keegan-Michael Key ("The Lion King" and "Toy Story 4"); actor Terry Crews ("America's Got Talent" and "Brooklyn Nine-Nine"); magician Joshua Jay;

Actor Jeff Goldblum (The Mountain (2018)); actress Andie MacDowell (Four Weddings and a Funeral (2019) and Ready or Not (2019)); Bishop Briggs performs;

Singer/songwriter John Legend (The Voice (2011) and Hitsville: The Making of Motown (2019)); actress Mandy Moore (This Is Us (2016) and Rapunzel's Tangled Adventure (2017)); Hollywood Vampires perform;

Actress Patricia Arquette (Otherhood (2019)); actor Michael Pena (Dora and the Lost City of Gold (2019)); The Bird and the Bee and Dave Grohl perform;

Actor Jamie Bell (Skin (2018)); actress Margaret Qualley (Once Upon a Time... in Hollywood (2019)); Freya Ridings performs;

Actor Pete Holmes; actor Domhnall Gleeson; actor Aldis Hodge; Machine Gun Kelly and Yungblud perform;

Actresses Melissa McCarthy and Elisabeth Moss (The Kitchen (2019)); Jakob Dylan and Jade Castrinos performs;

Actor Joel McHale; actress Betty Gilpin;

Actor Josh Gad (The Angry Birds Movie 2 (2019)); actress Michaela Watkins (Brittany Runs a Marathon (2019));

Actor Greg Kinnear (Brian Banks (2018) and Strange But True (2019)); actress Judy Greer (Driven (2018)); Bazzi performs;

Guest host RuPaul Charles; actor David Oyelowo (Don't Let Go (2019)); actor Alfie Allen (Game of Thrones (2011));

Actor Anthony Anderson; actor Jared Harris; singer Smokey Robinson; comic Christian Finnegan;

Actor Michael Douglas; actor Will Forte; comic Nicole Byer;