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. ...

Former soccer star David Beckham; model Elle Macpherson. Also: Vance Joy performs. ...

Kevin Costner (Black or White (2014)); Eddie Redmayne (Jupiter Ascending (2015)). Also: Jamie Cullum performs. ...

Channing Tatum (Jupiter Ascending (2015)); the NFL's J.J. Watt. Also: ZZ Top perform. ...

Edward Norton (Birdman or (The Unexpected Virtue of Ignorance) (2014)); sportscaster Al Michaels. Also: The Decemberists perform. ...

Ewan McGregor (Mortdecai (2015)); Lea Michele (Glee (2009)). Also: Tess Henley performs. ...

Eric Stonestreet (Modern Family (2009)); Stephen Amell (Arrow (2012)). Also: Logic performs. ...

Danny DeVito (It's Always Sunny in Philadelphia (2005)); Abbi Jacobson and Ilana Glazer (Broad City (2014)). Also: Bad Suns perform. ...

Johnny Depp (Mortdecai (2015)); Marion Cotillard (Two Days, One Night (2014)) (aka Two Days, One Night). Also: Kandace Springs performs. ...

Kaley Cuoco (The Wedding Ringer (2015)); Omar Epps (Resurrection (2010)). Also: Steel Panther perform. ...

Jessica Chastain (A Most Violent Year (2014)); Patricia Arquette (Boyhood (2014)). Also: Donald Glover performs. ...

Joaquin Phoenix (Inherent Vice (2014)); comedian Larry Wilmore. Also: Frankie Ballard performs. ...

Comedian Bill Maher; comedian Nick Kroll. Also: The Lone Bellow perform. ...

Matt LeBlanc (Episodes (2011)); Hayley Atwell (Agent Carter (2015)); chef Jamie Oliver. ...

Anne Hathaway (Interstellar (2014) and Song One (2014)); Chris Soules (The Bachelor (2002)). Also: Heart performs. ...

Jimmy Kimmel interviews celebrities. ...

Jimmy Kimmel interviews celebrities. ...

Jimmy Kimmel interviews celebrities. ...

Jimmy Kimmel interviews celebrities. ...