21x1 - Lena Dunham; Max Greenfield; Brandy Clark

January 6, 2014

From "Girls", creator and actress Lena Dunham; from "New Girl", actor Max Greenfield; musical guest Brandy Clark.

21x2 - Joel McHale; Marv Albert; Washed Out

January 7, 2014

From "Community", actor Joel McHale; sportscaster Marv Albert; musical guests Washed Out.

21x3 - Scarlett Johansson; John Grant

January 8, 2014

From "Captain America: The Winter Solider", actress Scarlett Johansson; musical guest John Grant.

21x4 - Anderson Cooper; Bobby Moynihan; Will Hoge

January 9, 2014

TV host Anderson Cooper; from "Saturday Night Live", comedian Bobby Moynihan; musical guest Will Hoge.

21x6 - Bill Cosby; Sleigh Bells

January 13, 2014

Comedy legend Bill Cosby; musical guests Sleigh Bells.

21x7 - Michael Strahan; Jennifer Nettles

January 14, 2014

From "LIVE with Kelly and Michael", co-host Michael Strahan; musical guest Jennifer Nettles.

21x8 - Kevin Hart; Mo Rocca; The Orwells

January 15, 2014

Actor and comedian Kevin Hart; from "My Grandmother’s Ravioli" and "CBS Sunday Morning", journalist Mo Rocca; musical guests The Orwells.

21x9 - Brian Williams; Rosanne Cash

January 16, 2014

New anchor Brian Williams; musical guest Rosanne Cash.

21x10 - Don Cheadle; Myq Kaplan; Roadkill Ghost Choir

January 17, 2014

From "House of Lies", actor/producer Don Cheadle; stand-up comedy by Myq Kaplan; musical guests Roadkill Ghost Choir.

21x11 - Andy Samberg; Michael B. Jordan; Ellie Goulding

January 21, 2014

From "Brooklyn Nine-Nine", actor and comedian Andy Samberg; from "That Awkward Moment", actor Michael B. Jordan; musical guest Ellie Goulding.

21x12 - Martin Scorsese; Allison Williams; Cults

January 22, 2014

From "The Wolf of Wall Street", director Martin Scorsese; from "Girls", actress Allison Williams; musical guests Cults.

21x13 - Rachel Maddow; Spike Jonze; No Age

January 23, 2014

TV host and journalist Rachel Maddow; from "Her", director and writer Spike Jonze; musical guests No Age.

21x14 - Kevin Bacon; Pat McGann; Devon Avenue

January 24, 2014

From "The Following", actor Kevin Bacon; stand-up comedy by Pat McGann; musical guests Devon Avenue.

21x15 - Louis C.K.; B.J. Ganem; Artic Monkeys

January 27, 2014

From "Louie", creator and comic Louis C.K.; Marine veteran B.J. Ganem; musical guests Artic Monkeys.

21x16 - Eric Stonestreet; Nick Goepper; Bastille

January 28, 2014

From "Modern Family", actor Eric Stonestreet; freeskier Nick Goepper; musical guests Bastille.

21x17 - Drew Brees; B.J. Novak; Against Me!

January 29, 2014

New Orleans Saints quarterback, Drew Brees; actor/author/comedian B.J. Novak; a Top Ten List presented by David Stern; musical guests Against Me!.

21x18 - Dr. Phil McGraw; Danny Koker; Dum Dum Girls

January 30, 2014

TV host Dr. Phil McGraw; from "Counting Cars", TV personality Danny Koker; musical guests Dum Dum Girls.

21x19 - Bill Murray; Eagulls

January 31, 2014

From "The Monuments Men", actor/comic Bill Murray; musical guests Eagulls.

21x20 - Will Arnett; Broken Bells

February 3, 2014

21x21 - George Clooney; Sting

February 4, 2014

21x22 - Matt Damon; Lenny Kravitz

February 5, 2014

21x23 - Patrick Stewart; The Flaming Lips

February 6, 2014

21x24 - Regis Philbin; Ms. Lauryn Hill

February 7, 2014

21x25 - Kevin Spacey, Amber Heard, a Top Ten List presented by the cast of

February 17, 2014

21x26 - Sage Kotsenburg, Kate Mara

February 18, 2014

Cole Swindell?

21x27 - Kaitlyn Farrington, Lupita Nyong'o, Little Dragon

February 19, 2014

21x28 - Keri Russell, Terry Fator

February 20, 2014

21x29 - Pauley Perrette, Jeff Caldwell, Lake Street Dive

February 21, 2014

21x30 - Kaley Cuoco-Sweeting, Dale Earnhardt, Jr., The Fray

February 24, 2014

21x31 - Olympic Gold Medalist Ted Ligety, Kat Dennings, Lo-Fang

February 25, 2014

21x32 - Meredith Vieira, Band of Horses

February 26, 2014

21x33 - Stupid Human Tricks, Simon Helberg, Young the Giant

February 27, 2014

21x34 - Jack (Jungle) Hanna, Jake Johannsen

February 28, 2014

21x35 - Zach Braff, Sgt. Brendan Marrocco & Dr. Andrew Lee, Future Islands

March 3, 2014

21x36 - Michael Keaton, Phantogram

March 4, 2014

21x37 - Tom Selleck, Carrie Brownstein, David Nail

March 5, 2014

21x38 - Tom Brokaw, Andrew Hadlock, Bob Mould

March 6, 2014

21x39 - Mary-Louise Parker, Lenny Marcus, Joan Jett & the Blackhearts

March 7, 2014

21x40 - Sen. John McCain, Little Mix

March 10, 2014

21x41 - Jason Bateman, Miles Teller, Gary Allan

March 11, 2014

21x42 - Sylvester Stallone, Theo James, Ledisi

March 12, 2014

21x43 - Bryan Cranston, Melissa Rauch, Le1f

March 13, 2014

21x44 - Bill O'Reilly, Nick Griffin, the Dough Rollers

March 14, 2014

21x45 - Jimmy Carter

March 24, 2014

21x46 - Emma Watson, Nick Offerman, a musical tribute to Johnny Cash

March 25, 2014

21x47 - Peter Dinklage, Hari Kondabolu, Sage the Gemini

March 26, 2014

21x48 - Cobie Smulders, Nick Cannon, Manchester Orchestra

March 31, 2014

21x49 - Kristin Chenoweth, Amy Schumer, Johnnyswim

April 1, 2014

21x50 - Bill Murray, Martha Stewart, Lady Gaga

April 2, 2014

21x51 - Johnny Depp, Kevin Drew

April 3, 2014

21x52 - Billy Crystal, Tony Hale, Liv Warfield

April 4, 2014

21x53 - Rob Lowe, Brooklyn Decker, London Grammar

April 8, 2014

21x54 - Lindsay Lohan, Jamie Edwards, Real Estate

April 9, 2014

21x55 - Courteney Cox, Jimmie 'J.J.' Walker, Christina Perri

April 21, 2014