Michael Cera, Jenna Elfman, and David Gray are the scheduled guests.

Amy Adams, Zachary Levi, and Vampire Weekend are the scheduled guests.

Marv Albert and Julian Casablancas are the scheduled guests.

Bradley Cooper, Rachel Maddow, and Nick Jonas are the scheduled guests. Plus, a Top Ten list from Homer Simpson!

Teri Hatcher, Jake Johannsen, and The Dodos are the scheduled guests.

Jennifer Connelly, Paul Teutul Sr., Ryan Bingham are the scheduled guests.

Findlay Brown are the scheduled guests.

Kiefer Sutherland, the Hotrats are the scheduled guests.

Denzel Washington, the Low Anthem are the scheduled guests.

Glenn Close, Eddie Brill, Matt Morris are the scheduled guests.

Kristen Bell, Randy Jackson, Charlotte Gainsbourg

Dwayne Johnson, the Swell Season

Claire Danes, Will Arnett, James Taylor & Carole King

Harrison Ford, Blind Boys of Alabama with Lou Reed

Catherine Zeta-Jones, Jeff Stilson, the Heavy

Bruce Willis, Ne-Yo

John Travolta, Ben Harper & Relentless7

Sarah Silverman, Jeremy Renner, Nneka

Jamie Foxx, Robin Thicke with Nicki Minaj

Jack Hanna, Joe Wong, the Swell Season

Sandra Bullock, Josh Turner

Jennifer Garner, the "Sports Illustrated" swimsuit issue cover model, Sade

Jessica Biel, Christoph Waltz

Regis and Joy Philbin, a Top Ten List presented by Benicio Del Toro

Jeff Bridges, Joe Wong, the Soft Pack

Actor Bill Murray; Ludacris performs.

Author Mitt Romney; actress Mia Wasikowska.

Comic Jerry Seinfeld; journalist Tom Brokaw.

Actor Tom Hanks.

Actor Matt Damon; comic Danny Bhoy; Corinne Bailey Rae performs.

TV host Kelly Ripa; Lady Antebellum performs.

Actress Julianna Margulies; grocery bagging champion Kyle Perry; Broken Bells perform.

Singer Jessica Simpson; Alkaline Trio performs.

Real estate mogul Donald Trump.

Actor Liev Schreiber; comic Jim Gaffigan; Drive-By Truckers perform.

Actress Jennifer Aniston; environmentalist Charles Moore.

TV host Jimmy Kimmel; actress Kirstie Alley; rapper Snoop Dogg presents the Top Ten list.

Actor Gerard Butler; actress Mindy Kaling; Free Energy performs.

Greg Kinnear; Lacey Brown; Michael Bublé; Harry Smith

Actor Ben Stiller; chef Jamie Oliver; Justin Bieber performs.

Actress Tina Fey; actor Bryan Cranston; Joan Jett and the Blackhearts perform.

Actor Robin Williams; eliminated 'American Idol' contestant Paige Miles; Usher performs.

Actor Luke Wilson; Pam Stout, Tea Party Patriot; Alan Jackson performs.

Actor Ricky Gervais; turkey callers; The Whigs perform.

Actor Sam Worthington; sportscasters Mike Greenberg and Mike Golic; Patty Loveless performs.

Actor Nathan Lane; She and Him perform.

Steve Carell, "American Idol" castoff Didi Benami, a performance from the Broadway musical "Addams Family"

Actor Chris Rock; actress Jane Lynch.

Actress Jennifer Lopez; radio hosts Mike Golic and Mike Greenberg; American Idol contestant.

Actress Amanda Peet; chef David Chang; Justin Nozuka performs.

Actor Eddie Murphy; Jakob Dylan performs.

Actor David Spade; EPA Administrator Lisa P. Jackson; Broken Social Scene performs.

Actor Kelsey Grammer; comic Jeff Altman; Sharon Jones and the Dap Kings perform.

Phil McGraw; Jon Gruden; David Sanborn; Tim Urban.

Singer Courtney Love; actor Michael Caine; Hole performs

Actor Robert Downey Jr.; OK Go performs.

Actress Gwyneth Paltrow; a performance by the Broadway cast of American Idiot.

Professional soccer player; David Beckham; comic Mike Birbiglia; the Hold Steady performs

Actor Mickey Rourke; actor Jim Parsons; eliminated 'American Idol' contestant Siobhan Magnus.

Actor Russell Crowe; Sharon Jones and the Dap-Kings perform.

Animal handler Jack Hanna; actress Kerry Washington; Willie Nelson performs.

Journalist Brian Williams; author Beth Ostrosky Stern; Court Yard Hounds perform.

Actress Amanda Peet; comic Nick Griffin; Wale performs.

Evangeline Lilly; Sam Rockwell; Aaron Kelly; 'Million Dollar Quartet'.

Queen Latifah, Will Forte, MGMT

Actress Jenna Fischer.

Actor Alec Baldwin; the National performs.

Actor Mike Myers; comic Tom Dreesen

Matthew Fox; Zac Brown Band; Jason Randal; Michael Lynche.

Jonah Hill; Janelle Monáe; John Carney; Miss USA 2010 presents the Top Ten list.

Actor Russell Brand; magician Johnny 'Ace' Palmer; Stone Temple Pilots perform

Actress Katherine Heigl; magician Steve Cohen; Band of Horses performs.

Ashton Kutcher; Larry Miller; Brooks & Dunn; Michael Ammar; Reba McEntire.

Jake Gyllenhaal, "American Idol" castoff Casey James

Sarah Jessica Parker, the Black Keys

Don Rickles, Piedmont Bird Callers, John Prine with Yim Yames of My Morning Jacket

Actress Jessica Biel; 'American Idol' winner Lee DeWyze.

Actress Kate Hudson; the winner of the Indianapolis 500; Sarah McLachlan performs.

Actor Bradley Cooper; TV personalities Khloe and Kourtney Kardashian; Christina Aguilera performs.

Actor Jaden Smith.

Actor Sean Hayes; comic Robert Klein; Allison Moorer performs.

Actress Helen Mirren; actor Colin Hanks; Cyndi Lauper performs.

Journalist Katie Couric; DEVO performs

Chef Emeril Lagasse.

Actress Miley Cyrus; TV personality Rick Harrison.

Comic Larry Miller; Fred Eaglesmith performs.

Actress Salma Hayek; Herbie Hancock performs.

Trombone Shorty & Orleans Avenue performs.

Actor Adam Sandler; Bettye LaVette performs.

Actor Kevin James; journalist Thomas L. Friedman.

Regis Philbin, Bill Burr

Actress Kristen Stewart; director Barry Sonnenfeld.

Singer Dolly Parton; journalist Jonathan Alter.

Actress Julianne Moore; astronaut Mike Massimino; The New Pornographers perform.

Actor Taylor Lautner; Tokyo Police Club performs.

Actress Jennifer Aniston; marine researcher Capt. Charles Moore.

Actor Nicolas Cage; Steel Train performs.

Actress Kristin Chenoweth; M.I.A. performs.

Summer toy demonstration; actor Joseph Gordon-Levitt; Laurie Anderson performs.

Actress Kyra Sedgwick; singer Bret Michaels; Jimmy Cliff performs.

Actress Megan Fox; actor Johnny Depp.

Actor Sylvester Stallone; actor Rob Corddry; Robyn perform

Actor Steve Carell; actress Selena Gomez; Sheryl Crow performs.

Alejandro Escovedo performs.

Comic Joan Rivers; comic Bill Burr; Steve Winwood performs.

Paul McCartney, a Top Ten List presented by Bruce Willis

Actor Denis Leary; MLB player Albert Pujols; Jimmy Webb performs.

Actor Luke Wilson; actress Kristen Schaal; Dierks Bentley performs.

Actor Michael Keaton; The Flaming Lips perform.

Actor Paul Rudd; comic Bill Burr; Interpol performs.

Actor Will Ferrell; Nas and Damian Marley perform.

Actor Michael Cera; TV show host Rachel Maddow; Herbie Hancock performs.

Actress Julia Roberts; The Dead Weather performs.

Actor Mark Wahlberg; dock-diving dogs; comic Cory Kahaney; VV Brown performs.

Journalist Brian Williams; Big Boi performs.

Actress Drew Berrymore; Katy Perry performs.

Actress Christina Applegate; The Pretty Reckless performs.

The Specials perform.

Jessica Alba

Jimmie Walker, Merle Haggard

Donald Trump, Bill McKibben

Will Arnett, Tommy Johnagin, Karen Elson

Actor Denis Leary. Jimmy Webb performs.

Actress Katie Holmes; TV personality Rick Harrison.

Actress Julianna Marguiles. The Black Angels perform.

Animal handler Jack Hanna; Jamey Johnson performs.

Former President Bill Clinton; Chromeo performs.

Actor Simon Baker; TV personality Nicole 'Snooki' Polizzi; Maroon 5 performs.

Actor Joaquin Phoenix; Tom Jones performs.

Actor James Franco; actress Sofía Vergara.

Actor Shia LaBeouf; comic Brian Regan; Jimmy Eat World performs.

Actress Katherine Heigl; actor Daniel Dae Kim; Runner Runner performs.

TV host Jon Stewart; N.E.R.D. performs.

New York Mayor Michael Bloomberg (Ind); actor Jesse Eisenberg.

Actor Tom Selleck; author Janet Elder; Tired Pony performs.

Actress Blake Lively; actor Michael C. Hall; Drake performs.

Actor Bruce Willis; will.i.am performs with Nicki Minaj.

Author Tony Blair; Mavis Staples and Jeff Tweedy perform.

Actor John Malkovich; talk-show host Julie Chen.

TV host Stephen Colbert; actor Johnny Knoxville; Gorillaz perform.

TV host Rachael Ray; comic Allan Havey; Antony and the Johnsons perform.

Jim Parsons; Geoffrey Canada; Mark Ronson and the Business Intl. performs with Q-Tip and MNDR.

Actor Matt Damon; My Morning Jacket performs.

Actress Hilary Swank.

Rapper Diddy; actress Emma Stone; Diddy-Dirty Money performs.

Actor David Duchovny; actress Amy Sedaris; comic Mike E. Winfield.

Charles Barkley, Garry Dell'Abate, Kings of Leon

Taylor Swift, Seth Meyers

Dana Carvey

Will Ferrell, Kid Cudi

Michael J. Fox, Shaun White

Robert Downey Jr., Elvis Costello

TBA

Tina Fey, Brad Paisley

Steve Martin, Emily Deschanel

Tracy Morgan, Mike E. Winfield, the Secret Sisters

Actor Harrison Ford; Cee Lo Green performs.

Actor Denzel Washington; Bon Jovi performs.

Actor Russell Crowe; musician Quincy Jones; Snoop Dogg performs.

Singer Cher; Stupid Human Tricks; Bruno Mars performs.

TV host Kelly Ripa; comic Greg Fitzsimmons; Reba McEntire performs.

Actress Emma Watson; actor Scott Caan; Rascal Flatts performs.

Rapper Jay-Z; chef Jamie Oliver; Rihanna performs

Actor Jake Gyllenhaal; author Fran Lebowitz; Ne-Yo performs.

Actor Jim Carrey.

Actor Billy Bob Thornton; comic Mike E. Winfield; the Secret Sisters perform.

Actress Natalie Portman; comic Jay Pharoah; Jessica Simpson performs.

Comic Jerry Seinfeld; actor Colin Firth.

U.S Army Staff Sgt. Salvatore Giunta.

Ray Romano, John Mellencamp

Johnny Depp, Ra Ra Riot, George Benson

Barbara Walters, Alison Balsom

Bill O'Reilly

Reese Witherspoon, Colin Quinn

Actor Ricky Gervais; actress Hailee Steinfeld; Diddy-Dirty Money performs.

Actor Paul Rudd; Joanna Newsom performs.

Comic Tom Dreesen; Ronnie Spector performs.

Actor Matt Damon; Florence & the Machine perform.

Actors Dustin Hoffman and Robert De Niro; comic Hannibal Buress.

Jack Black, Marv Albert

Jamie Foxx, Sofia Vergara

Denis Leary, Grace Potter & the Nocturnals

Amanda Peet, Jay Thomas, Darlene Love