Season 12

From "Cougar Town", actress Courteney Cox; “The Bachelor” Juan Pablo Galavis; musical guest Johnathan Rice.

Actress Amy Adams; actress Margot Robbie; musical guests Xolie Morra & The Strange Kind.

From "Modern Family", actress Sofia Vergara; actress Emmy Rossum; musical guest Yuna.

Actress Kristen Wiig; comedian Nick Kroll; musical guests Lord Huron.

From "Jack Ryan: Shadow Recruit", actor Kevin Costner; from "American Idol", judge Harry Connick Jr.; musical guest Michael Kiwanuka.

From "Episodes", actor Matt LeBlanc; from "12 Years a Slave", actress Lupita Nyong'o; musical guests The Fray.

From "August Osage County", actress Meryl Streep; from "HitRECord on TV!", host Joseph Gordon-Levitt; musical guest Jonny Lang.

From "Jack Ryan: Shadow Recruit", actor Chris Pine; from "Shark Tank", participant Kevin O'Leary; musical guest Gregory Porter.

From "NCIS: Los Angeles", actor and rapper LL Cool J; from "Agents of S.H.I.E.L.D.", actress Chloe Bennet; musical guests Vampire Weekend.

From "Rake", actor Greg Kinnear; from "Jack Ryan: Shadow Recruit", director and actor Kenneth Branagh; musical guests Young the Giant.

From "Lizzie Borden", actress Christina Ricci; from "New Girl", actor Jake Johnson; musical guest Danny Brown.

From "Keeping Up with the Kardashians", reality star Kim Kardashian; from "The Bachelor: Sean and Catherine's Wedding", Sean Lowe & Catherine Giudici; musical guest Jason Derulo.

From "NCIS: Los Angeles", actor Chris O'Donnell; player for the NBA Indiana Pacers, Paul George; musical guests The Airborne Toxic Event.

Actor Morgan Freeman; from "Mom", actress Anna Faris; musical guests Mötley Crüe.

From "At Middleton", actor Andy García; chef Norman Van Aken; musical guests Broken Bells.

From "That Awkward Moment", actor Zac Efron; from "The Lego Movie", actress Alison Brie; musical guest Sara Bareilles.

Sharon Osbourne from "The Talk"; actors Shailene Woodley and Theo James ("Divergent"); Zedd performs.

Actor Barkhad Abdi ("Captain Phillips"); Dr. Mehmet Oz; The Lone Bellow performs.

Actor Ashton Kutcher ("Two and a Half Men"); actress Sarah Paulson ("12 Years a Slave"); The Head and the Heart perform.

The cast of George Clooney's The Monuments Men

Actors Ethan Hawke & Julie Delpy; actor Joel Kinnaman; Eric Church performs.

Seattle Seahawks Richard Sherman & Malcolm Smith; actor Gary Oldman; music from Crosses †††

Actor Nathan Fillion; actor Abbie Cornish; Naughty Boy and Sam Smith perform.

Actor Kevin Hart; actor Alex Pettyfer; Sage the Gemini performs.

Will Arnett; Sports Illustrated Swimsuit Issue Cover Models Nina Agdal, Lily Aldridge and Chrissy Teigen; Music from Silversun Pickups.

Author Bill O'Reilly; actor Kit Harington; Phantogram performs.

Actor Matthew McConaughey; actress June Squibb; Switchfoot performs.

Actor Jonah Hill; TV personalities Willie Robertson and Korie Robertson; New Politics performs.

Actor Liam Neeson; animal expert Dave Salmoni; Josh Groban performs.

Actor Joel McHale; actor Ansel Elgort; music from Benmont Tench.

TV show host Ellen DeGeneres; director Tom Ford; Sky Ferreira performs.

Actress Kerry Washington; TV show host Michael Strahan; Juicy J and Wiz Khalifa perform.

Toronto Mayor Rob Ford; The Muppets' The Great Gonzo.

Actress Jane Lynch; actor Omar Epps; Musical guest Fitz & The Tantrums.

Actor Ricky Gervais; Kongos performs.

Actor Aaron Paul; actress Bellamy Young; Music from Jetta.

Jimmy Kimmel takes the show to Austin, Texas. Actor Seth Rogen ("Neighbors"), rapper-actor Snoop Dogg (1st Annual Wellness Retreat); musical guest White Denim.

Actress Rosario Dawson ("Cesar Chavez"); Gov. Rick Perry; Music from Aloe Blacc; Jimmie Vaughn sits in with the house band.

Actor Robert Duvall ("A Night In Old Mexico"); celebrity chef Rachael Ray ("The Rachael Ray Show"); musical guest Damon Albarn; musical guest Johnny Winter will sit in with house band Cleto and the Cletones.

Musical guest Lady Gaga; actress Darby Stanchfield ("Scandal"); musical guest The Preatures.

Rapper Lil Wayne; panelist and musical guest Willie Nelson; Los Lonely Boys sits in with Cleto and the Cletones.

Actress Uma Thurman; actor Jai Courtney; Amos Lee performs.

Actress Ashley Judd; TV host Howie Mandel; Sam Smith performs.

Actor Jeremy Piven; actress Zoe Kravitz; YG performs.

Actor Don Cheadle; actor Tony Goldwyn; Enrique Iglesias performs.

Actress Jennifer Connelly; actor Rohan Chand; Sharon Jones & the Dap-Kings perform.

Actress Nicole Kidman; actress Alyson Hannigan; Jerrod Niemann performs.

Actress Julia Louis-Dreyfus; actor Michael Peña; London Grammar performs.

Actor Jason Bateman; actress Katie Lowes; John Legend performs.

Actress Mindy Kaling; comic Jim Jefferies; Dan Croll performs.

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President Bill Clinton; Manny Pacquiao performs.

Actress Emma Stone; actor Jeff Perry; Schoolboy Q performs.

Actor Seth MacFarlane; actor Paul Bettany; Sam Smith performs; the 2014 ESPYS host Drake.

"Scandal" creator Shonda Rhimes discusses the season three finale; secrets from the "Scandal" cast and a previously unseen blooper reel; Kimmel's Spanish-language spinoff, "Escandalo."

Model Kate Upton; actor Cole Hauser; Neon Trees performs.

Actor Seth MacFarlane; actor Paul Bettany; Sam Smith performs.

Actor Tim Allen; actress Ginnifer Goodwin; Foster the People perform.

Actress Julie Bowen; comic Dave Attell; Cut Copy performs.

Actor Tim Allen; actress Ginnifer Goodwin; Foster the People perform.

Actors Eric Stonestreet and Jesse Tyler Ferguson; TV host Robin Roberts.

Actress Jennifer Lopez; actress Elizabeth moss; Sleepy Man Banjo Boys perform.

Actors Eric Stonestreet and Jesse Tyler Ferguson; reporter Robin Roberts.

Comic Kathy Griffin; actor Tony Hale; Franz Ferdinand performs.

Actress Sandra Oh; "Science Bob" Pflugfelder; Boy George performs.

Actress Sally Field; actress Julia Roberts; Future Islands performs.

Actor Jon Hamm; actress Emma Roberts; Kid Ink performs with Travis Barker.

Musician Pharrell Williams is interviewed and performs.

Actress Shailene Woodley; actor Aasif Mandvi; Iggy Azalea performs.

Actor Nathan Lane; author Adam Carolla; Royal Blood performs.

Actress Shailene Woodley; actor Aasif Mandvi; Iggy Azalea performs.

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TV host George Stephanopoulos; reality-TV star Andi Dorfman.

Actor Johnny Knoxville; animal trainer Dave Salmoni; Timeflies performs.

Actor Adam Sandler; actress Elle Fanning; Lykke Li performs.

Actress Patricia Heaton; actor T.J. Miller; Little Dragon performs.

Actor Martin Lawrence.

Scripps National Spelling Bee champions; rapper Curtis "50 Cent" Jackson; actress Jenny Slate; OneRepublic performs.

Rapper Curtis "50 Cent" Jackson; Jenny Slate ("Obvious Child"). Also: OneRepublic perform.

Actor Gerard Butler; actress Meagan Goode; Matisyahu performs.

Actor Robert Pattinson; actor Pablo Schreiber; Nico & Vinz perform.

Actress Lena Headey; Jungle performs.

Musicians Ludacris, Kesha, Josh Groban and Brad Paisley; Internet personality Michael Stevens; Brad Paisley performs.

Former boxer Mike Tyson; Jason Momoa ("Road to Paloma"). Also: Young Fathers perform.

2014 NBA Champions San Antonio Spurs’ Tony Parker, Eric Bana, Music from Linkin Park

Actress Roseanne Barr; actor Eric Dane; Tech N9NE performs.

Actor Gary Oldman; actor Nathan Fielder; Bleachers performs.

Actor Bob Newhart; actress Nicola Peltz; Spoon performs.

Actress Melissa McCarthy; actor Marc Maron; Röyksopp & Robyn perform.

Actor Dane Cook; actor Mark Duplass; Trey Songz performs.

Actress Susan Sarandon; actor Ramon Rodriguez; Robin Thicke performs; professional baseball player Yasiel Puig.

Actress Jessica Alba; actor Ben Falcone; Sia performs.

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Actor John Stamos; comic Todd Glass; OK Go performs.

John Stamos ("My Man Is a Loser"); comedian Todd Glass. Also: OK Go perform.

Gordon Ramsay ("Hotel Hell"); Bobcat Goldthwait ("Willow Creek"). Also: Common performs.

Justin Theroux ("The Leftovers"); Angie Harmon ("Rizzoli & Isles"). Also: 5 Seconds of Summer perform.

Actor Daniel Radcliffe; actress Abigail Spencer; Kiesza performs.

Actor Eric McCormack; Self performs.

Actress Kerry Washington; musician Tom Petty; Tom Petty & the Heartbreakers perform.

Reality-TV star Kim Kardashian; actors Damon Wayans Jr. and Jake Johnson; Disclosure and Sam Smith perform.

Actor Ted Danson; actress Eva Green; Jake Owen performs.

Actress Chloë Grace Moretz; The Mighty Mighty Bosstones performs.

Actor Mickey Rourke; actress Jordana Brewster; Banks performs.

Actor Idris Elba; reality-TV personality Tim Gunn; The White Buffalo performs.

Actress Jennifer Aniston.

Actor Aaron Paul; Ed Sheeran performs.

Paolo Nutini performs.

Actress Eva Longoria; Wiz Khalifa performs.

Actress Gwyneth Paltrow; actor Terry Crews; Shawn Mendes performs.

Actress Taraji P. Henson; Hunter Hayes performs.

Sports analyst Terry Bradshaw; actors Mike Smith, John Paul Tremblay and Robb Wells; The Kooks perform.

Actress Lena Dunham; actor Ben Schwartz.

Actor Bill Hader; director Richard Linklater; Jhene Aiko performs.

TV host Queen Latifah; stock car racing driver Dale Earnhardt Jr.

Actor Morgan Freeman; reality-TV personality Julianne Hough.

Actress Jane Fonda; actor Ike Barinholtz; Mastodon performs.

Actors Keegan-Michael Key and Jordan Peele; journalist David Muir; Fall Out Boy performs.

Actor Ty Burrell; TV personality Len Goodman; Paolo Nutini performs.

Actress Kaley Cuoco; actor Anthony Anderson; Bastille performs.

Actress Courteney Cox; actor John Cho; Jason Aldean performs.

Actress Viola Davis; TV host Anthony Bourdain; Tove Lo performs.

Actor Patrick Dempsey; author Lara Spencer; Young Jeezy performs.

Actor Denzel Washington; actress Darby Stanchfield; The Script performs.

Actress Jennifer Love Hewitt; actor Clark Gregg; Clean Bandit performs.

Actor Martin Short; animal trainer Dave Salmoni; Steve Aoki performs with Waka Flocka Flame and Travis Barker.

Martin Short, Animal Trainer Dave Salmoni, Music from Steve Aoki Feat. Waka Flocka Flame and Travis Barker.

Actress Ellen Pompeo; actor Norman Reedus; Disclosure performs with Mary J. Blige.

Ellen Pompeo, Norman Reedus, Music from Disclosure feat. Mary J. Blige.

Dax Shepard, Karen Gillan, Music from Rixton.

Actress Kyra Sedgwick; actor Jon Bernthal; Dirty Heads performs.

Kyra Sedgwick, Jon Bernthal, Music from Dirty Heads.

LL Cool J, Michael Peña, Music from Tinashe Feat. Schoolboy Q.

Shia LaBeouf, Michelle Monaghan, Music from T.I.

Adam Carolla, Cristela Alonzo, Music from Bob Seger.

Selena Gomez, Chris O’Dowd, Music from Kasabian.

"Shark Tank" pitch results.

Actor Ice Cube; "Science Bob" Pflugfelder; Bush performs.

Actor Bill Murray; actors Jack Black and Kyle Gass.

Actress Melissa McCarthy; actor Frank Grillo; Billy Idol performs; "Shark Tank" pitch results.

Taylor Swift, Alfred Enoch, Music from Taylor Swift.

Actor Will Arnett; actress Lisa Kudrow; Lady Antebellum performs.

Actor Scott Foley; Smokey Robinson, Aloe Blacc and JC Chasez perform.

Halloween costume pageant; actor Andy Samberg; actress Rosie Perez; The Flaming Lips perform.

Scott Foley, music from Aloe Blacc.

Halloween costume pageant; actor Andy Samberg; actress Rosie Perez; Slipknot performs.

Kimmel appears simultaneously in Los Angeles and Nashville using hologram technology.

Actress Geena Davis; Cobra Starship performs with Icona Pop.

Actor Christoph Waltz; actress Aubrey Plaza.

Actor Mike Myers; actress Gugu Mbatha-Raw; Tears for Fears performs.

Actor Jim Carrey; actress Bellamy Young; Oran "Juice" Jones performs.

People's Sexiest Man Alive cover reveal; actor Jason Bateman; actress Courtney Love.

Actor Jamie Foxx; actress Tracee Ellis Ross; The New Basement Tapes perform.

Musical group One Direction; actor Tom Verica; Jessie J performs.

Actress Jennifer Aniston; actor Ken Jeong.

Actor Chris Pine; actress Evangeline Lilly; Pitbull and Ne-Yo perform.

Actress Mindy Kaling; UFC Women's Bantamweight champion Ronda Rousey; Rick Ross performs.

Actor Don Rickles; NASCAR champion Kevin Harvick; Chase Rice performs.

Actor Ethan Hawke; actor Timothy Spall; Walk the Moon performs.

Actress Sofia Vergara; actor J.K. Simmons.

TV host Ryan Seacrest; actress Rebecca Romijn; Vintage Trouble performs.

Actor Aaron Paul; actress Krysten Ritter; Bobby Shmurda performs.

Sports broadcasters Chris Fowler and Kirk Herbstreit; Priority performs.

Actress Marisa Tomei; Smashing Pumpkins perform.

Musician Blake Shelton; actress Laura Dern.

Actress Emily Blunt; actor Lee Pace; Alt-J performs.

Actress Tracey Ullman; Garth Brooks performs.

Actor Michael Keaton; TV host Megyn Kelly; George Ezra performs.

Comic Mel Brooks; actress Christine Baranski; Jenny Lewis performs.