Maisie Williams (Game of Thrones (2011)). Also: Saint Motel perform. ...

Chelsea Clinton; Adam Carolla. Also: Zac Brown Band perform. ...

Willie Nelson; Colin Hanks (All Things Must Pass: The Rise and Fall of Tower Records (2015)). Also: Edward Sharpe and the Magnetic Zeros and Edward Sharpe and the Magneti ...

Bill Murray; cast of The Walking Dead (2010)). Also: The Weeknd perform. Broadcast from the Joe R. and Teresa Lozano Long Center for the Performing Arts in Austin, Texas. ...

Dallas Cowboys quarterback Tony Romo; comedian Hannibal Buress. Also: James Bay performs. Broadcast from the Joe R. and Teresa Lozano Long Center for the Performing Arts ...

Julia Louis-Dreyfus (Veep (2012)); Robert Rodriguez (The Director's Chair (2014)); Spoon perform. Broadcast from the Joe R. and Teresa Lozano Long Center for the Performi ...

Kevin Hart (Get Hard (2015) and The Wedding Ringer (2015)). Also: Brad Paisley perform. Broadcast from the Joe R. and Teresa Lozano Long Center for the Performing Arts in ...

President Barack Obama; Sean Penn (The Gunman (2015)). Also: Earth Wind and Fire perform. ...

Liam Neeson (Run All Night (2015)); Octavia Spencer (Insurgent (2015)). Also: AWOLNATION perform. ...

Jennifer Lopez, Keith Urban, Harry Connick Jr., Ryan Seacrest (American Idol (2002)); Eric André (Man Seeking Woman (2015)); Keith Urban performs. ...

Bette Midler; The Bachelorette (2003). Also: The Afghan Whigs perform. ...

Naomi Watts (Insurgent (2015)). Also: Carly Rae Jepsen performs. ...

Vince Vaughn (Unfinished Business (2015)); former boxer Mike Tyson. Also: 'Drew Holcomb and the Neighbors' perform. ...

Starring Bridgit Mendler (Undateable (2014)); comedian Beth Stelling and Chef Gordon Ramsay who tested Jimmy's palate by giving him a blind taste test. ...

Cate Blanchett (Cinderella (2015)); Ryan Phillippe (Secrets and Lies). Also: Joywave perform. ...

Viola Davis (How to Get Away with Murder (2014)); Richard Madden (Cinderella (2015)); Common. Also: Liv Warfield performs. ...

Will Smith (Focus (2015)); Elizabeth Henstridge (Marvel's Agents of S.H.I.E.L.D. (2013)). Also: Sam Hunt performs. ...

Will Forte (The Last Man on Earth (2015)); Bella Thorne (The Duff (2015)). Also: Prince Royce performs. ...

NBA star Kobe Bryant. Also: Kenny G and Warren G perform as Kenny and Warren G on Mash Up Monday. ...

Kelly Ripa (Live with Kelly and Ryan (1988); Joshua Malina (Scandal (2012)). Also: Gorgon City perform with Jennifer Hudson. ...

Academy Awards host Neil Patrick Harris; Gillian Jacobs (Girls (2012)); Anthony Anderson (Black-ish (2014)). Also: Rascal Flatts perform. ...

Independent Spirit Awards co-hostess Kristen Bell; Chris Elliott (Schitt's Creek (2015)). Also: Big Sean performs. ...

Benedict Cumberbatch (The Imitation Game); Stana Katic (Castle); Chris Soules (The Bachelor). Also: Aloe Blacc and Blackstreet perform as AloeBlaccStreet on Mash Up Monda ...

Keira Knightley (The Imitation Game (2014)); Tony Goldwyn (Scandal (2012)). Also: Incubus perform. ...

David Spade; Randall Park (Fresh Off the Boat (2015)). The Band Perry perform. ...

Anna Faris (Mom (2013)); sportscasters Jeff Van Gundy and Mark Jackson. Also: Annie Lennox performs. ...

Bill O'Reilly (The O'Reilly Factor (1996)); Kelly Osbourne. Also: Morris Day and The Time perform with HAIM as Morris Day and the Haim on Mash Up Monday. ...

Magic Johnson; Scott Foley (Scandal (2012)). Also: Magic! perform. ...

Jeff Bridges (Seventh Son (2014)) is a panel guest and performs. Also: Lauren Cohan (The Walking Dead (2010)). ...

Mila Kunis (Jupiter Ascending (2015)); Bob Odenkirk (Better Call Saul (2015)). Also: Charli XCX performs. ...

Eva Longoria (A Path Appears (2015)). Also: Weezer and ZZ Top perform as Wee-Z Top on the inaugural Mash Up Mondays. ...

Kerry Washington (Scandal (2012)); animal trainer Dave Salmoni. Also: Ne-Yo performs. ...