13x1 - Anne Hathaway, Chris Soules, Heart

January 5, 2015

13x2 - Matt LeBlanc, Hayley Atwell, Jamie Oliver

January 6, 2015

13x3 - Bill Maher, Nick Kroll, The Lone Bellow

January 7, 2015

13x4 - Joaquin Phoenix, Larry Wilmore, Frankie Ballard

January 8, 2015

13x5 - Jessica Chastain, Patricia Arquette, Childish Gambino

January 13, 2015

Jessica Chastain, Patricia Arquette, Childish Gambino

13x6 - Kaley Cuoco-Sweeting, Omar Epps, Steel Panther

January 14, 2015

Kaley Cuoco-Sweeting, Omar Epps, Steel Panther

13x7 - Johnny Depp, Marion Cotillard, Kandace Springs

January 15, 2015

Johnny Depp, Marion Cotillard, Kandace Springs

13x8 - Danny DeVito, Abbi Jacobson, Ilana Glazer, Bad Suns

January 19, 2015

Danny DeVito, Abbi Jacobson, Ilana Glazer, Bad Suns

13x9 - Eric Stonestreet, Stephen Amell, Logic

January 20, 2015

Eric Stonestreet, Stephen Amell, Logic

13x10 - Ewan McGregor, Lea Michele, Tess Henley

January 21, 2015

Ewan McGregor, Lea Michele, Tess Henley

13x11 - Edward Norton, Al Michaels, The Decemberists

January 22, 2015

Edward Norton, Al Michaels, The Decemberists

13x12 - Channing Tatum, J.J. Watt, ZZ Top

January 26, 2015

Channing Tatum, J.J. Watt, ZZ Top

13x13 - Kevin Costner, Eddie Redmayne, Jamie Cullum

January 27, 2015

Kevin Costner, Eddie Redmayne, Jamie Cullum

13x14 - David Beckham, Elle Macpherson, Vance Joy

January 28, 2015

David Beckham, Elle Macpherson, Vance Joy

13x15 - Kerry Washington, Dave Salmoni, Ne-Yo

January 29, 2015

Kerry Washington, Dave Salmoni, Ne-Yo

13x16 - Rob Gronkowski, Eva Longoria, Weezer, ZZ Top

February 2, 2015

Guests Rob Gronkowski, Eva Longoria. Weezer and ZZ Top perform as WeeZ Top on the inaugural "Mash Up Mondays"

13x17 - Mila Kunis, Bob Odenkirk, Charli XCX

February 3, 2015

Mila Kunis, Bob Odenkirk, Charli XCX

13x18 - Jeff Bridges, Lauren Cohan

February 4, 2015

Lauren Cohan, Interview and Music from Jeff Bridges

13x19 - Magic Johnson, Scott Foley, Magic!

February 5, 2015

Magic Johnson, Scott Foley, Magic!

13x20 - Bill O'Reilly, Kelly Osbourne, Morris Day & The Time with Haim

February 9, 2015

Bill O'Reilly, Kelly Osbourne, Morris Day & The Time with Haim

13x21 - Anna Faris, Jeff Van Gundy & Mark Jackson, Annie Lennox

February 10, 2015

Anna Faris, Jeff Van Gundy & Mark Jackson, Annie Lennox

13x22 - David Spade, Randall Park, The Band Perry

February 11, 2015

David Spade, Randall Park, The Band Perry

13x23 - Keira Knightley, Tony Goldwyn, Incubus

February 12, 2015

Keira Knightley, Tony Goldwyn, Incubus

13x24 - Benedict Cumberbatch, Stana Katic, Chris Soules, Aloe Blacc & Blackstreet

February 16, 2015

Benedict Cumberbatch, Stana Katic, Chris Soules, Aloe Blacc & Blackstreet

13x25 - Kristen Bell, Chris Elliott, Big Sean

February 17, 2015

Kristen Bell, Chris Elliott, Big Sean

13x26 - Neil Patrick Harris, Gillian Jacobs, Rascal Flatts

February 18, 2015

Neil Patrick Harris, Gillian Jacobs, Rascal Flatts

13x27 - Kelly Ripa, Joshua Malina, Gorgon City feat. Jennifer Hudson

February 19, 2015

Kelly Ripa, Joshua Malina, Gorgon City feat. Jennifer Hudson

13x28 - Kobe Bryant, Chrissy Teigen, Kenny G & Warren G

February 23, 2015

Kobe Bryant, Chrissy Teigen, Kenny G & Warren G

13x30 - Will Smith, Elizabeth Henstridge, Sam Hunt

February 25, 2015

Will Smith, Elizabeth Henstridge, Sam Hunt

13x31 - Viola Davis, Richard Madden, Common

February 26, 2015

Viola Davis, Richard Madden, Common

13x34 - Vince Vaughn, Mike Tyson

March 4, 2015

Vince Vaughn, Mike Tyson

13x35 - Naomi Watts, Reggie Miller, Carly Rae Jepsen

March 5, 2015

Naomi Watts, Reggie Miller, Carly Rae Jepsen

13x36 - Bette Midler, the next Bachelorette, Afghan Whigs

March 9, 2015

Bette Midler, the next Bachelorette, Afghan Whigs

13x37 - Jennifer Lopez, Keith Urban, Harry Connick Jr., Ryan Seacrest, Eric Andre

March 10, 2015

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

13x38 - Liam Neeson, Octavia Spencer, AWOLNATION

March 11, 2015

Liam Neeson, Octavia Spencer, AWOLNATION

13x39 - President Barack Obama, Sean Penn, Earth, Wind & Fire

March 12, 2015

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

13x40 - Kevin Hart, Brad Paisley

March 16, 2015

Kevin Hart, Brad Paisley

13x41 - Julia Louis-Dreyfus, Robert Rodriguez, Spoon

March 17, 2015

Julia Louis-Dreyfus, Robert Rodriguez, Spoon

13x42 - Tony Romo, James Bay

March 18, 2015

Tony Romo, James Bay

13x43 - Bill Murray, The cast of The Walking Dead

March 19, 2015

Bill Murray, The cast of The Walking Dead

13x44 - Kanye West, Willie Nelson

March 20, 2015

Kanye West, Willie Nelson

13x45 - Kathy Griffin, Chris Fowler, Kirk Herbstreit, Priory

December 9, 2014

Comic Kathy Griffin; sports broadcasters Chris Fowler and Kirk Herbstreit; Priory performs.

13x48 - Zooey Deschanel, Guillermo Diaz, Charlie Wilson

March 26, 2015

Zooey Deschanel, Guillermo Diaz, Charlie Wilson

13x49 - Vin Diesel, Music from Van Halen

March 30, 2015

Vin Diesel, Music from Van Halen

13x50 - Michael Keaton, Megyn Kelly, George Ezra

December 17, 2014

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

13x51 - Mel Brooks, Christine Baranski, Jenny Lewis

December 18, 2014

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

13x52 - Anne Hathaway, Chris Soules, Heart

January 5, 2015

Actress Anne Hathaway; reality-TV star Chris Soules; Heart performs.

13x53 - Matt LeBlanc, Hayley Atwell, Jamie Oliver

January 6, 2015

Actor Matt LeBlanc; actress Hayley Atwell; chef Jamie Oliver.

13x54 - Bill Maher, Nick Kroll, The Lone Bellow

January 7, 2015

TV-show host Bill Maher; actor Nick Kroll; The Lone Bellow performs.

13x55 - Joaquin Phoenix, Larry Wilmore, Frankie Ballard

January 8, 2015

Actor Joaquin Phoenix; comic Larry Wilmore; Frankie Ballard performs.

13x56 - Jessica Chastain, Patricia Arquette, Childish Gambino

January 13, 2015

Actress Jessica Chastain; actress Patricia Arquette; Childish Gambino performs.

13x57 - Kaley Cuoco-Sweeting, Omar Epps, Steel Panther

January 14, 2015

Actress Kaley Cuoco-Sweeting; actor Omar Epps; Steel Panther performs.

13x58 - Johnny Depp, Marion Cotillard, Kandace Springs

January 15, 2015

Actor Johnny Depp; actress Marion Cotillard; Kandace Springs performs.

13x59 - Abbi Jacobson, Ilana Glazer, Bad Suns

January 19, 2015

Actresses Abbi Jacobson and Ilana Glazer; Bad Suns perform.

13x60 - Episode 60

January 20, 2015

Actor Eric Stonestreet; actor Stephen Amell.

13x61 - Ewan McGregor, Lea Michele, Tess Henley

January 21, 2015

Actor Ewan McGregor; actress Lea Michele; Tess Henley performs.

13x62 - Edward Norton, Al Michaels, The Decemberists

January 22, 2015

Actor Edward Norton; sportscaster Al Michaels; The Decemberists perform.

13x63 - Episode 63

January 26, 2015

Actor Channing Tatum; professional football player J.J. Watt; ZZ Top performs.

13x64 - Episode 64

January 27, 2015

Actor Kevin Costner; actor Eddie Redmayne; Jamie Cullum performs.

13x65 - Episode 65

January 28, 2015

Former professional soccer player David Beckham; model Elle Macpherson; Vance Joy performs.

13x66 - Episode 66

January 29, 2015

Actress Kerry Washington; animal handler Dave Salmoni; Ne-Yo performs.

13x71 - Episode 71

February 9, 2015

TV host Bill O'Reilly; TV personality Kelly Osbourne; Mashup Monday features a performance from "Morris Day and the HAIM" (Morris Day and The Time and HAIM).

13x72 - Episode 72

February 10, 2015

Actress Anna Faris; sportscasters Jeff Van Gundy and Mark Jackson; Annie Lennox performs.

13x73 - Episode 73

February 11, 2015

Sam Smith performs.

13x74 - Keira Knightley, Incubus

February 12, 2015

Actress Keira Knightley; Incubus performs.

13x75 - Episode 75

February 16, 2015

Mashup Monday features a performance from "Aloe Blaccstreet" (Aloe Blacc and Blackstreet).

13x76 - Kristen Bell, Chris Elliott, Big Sean

February 17, 2015

Actress Kristen Bell; actor Chris Elliott; Big Sean performs.

13x77 - Neil Patrick Harris, Gillian Jacobs, Rascal Flatts

February 18, 2015

Actor Neil Patrick Harris; actress Gillian Jacobs; Rascal Flatts perform.

13x78 - Kelly Ripa, Joshua Malina, Gorgon City & Jennifer Hudson

February 19, 2015

TV host Kelly Ripa; actor Joshua Malina; Gorgon City performs with Jennifer Hudson.

13x79 - After the Oscars

February 22, 2015

A post-Oscar celebration; actor John Travolta.

13x80 - Kobe Bryant

February 23, 2015

Professional basketball player Kobe Bryant.

13x81 - Will Forte, Bella Thorne, Prince Royce

February 24, 2015

Actor Will Forte; actress Bella Thorne; Prince Royce performs.

13x82 - Episode 82

February 25, 2015

Actor Will Forte; actress Elizabeth Henstridge; Sam Hunt performs.

13x83 - Viola Davis, Richard Madden

February 26, 2015

Actress Viola Davis; actor Richard Madden.