Demi Lovato and Jimmy Fallon Play Teen Girls in "Ew!' SketchDemi held her own in the comedy department, practicing kissing on an Ed Sheeran pillow (Fallon's had Mario Lopez's face on it).
Jennifer Lopez Struts Her Stuff in Silly Dance Battle on 'Fallon'Fallon went first, making up a silly dance called, “Skinny Jeans.” Lopez proceeded to show him up with a very J.Lo version of “Washing Machine Spin Cycle.”
Watch Niall Horan Perform 'This Town' on 'The Tonight Show'Horan is the second member of One Direction to play solo on the program. Zayn Malik performed “It’s You,” from 'Mind of Mine' in February.
Justin Timberlake Joins Jimmy Fallon at Camp in 'Tonight Show' SkitIn a room surrounded by childhood games of the '90s like Guess Who? and Battleship, the two friends decide to sing a song they heard on the radio earlier that day -- "Ironic" by Alanis Morissette.
Sarah Paulson Raps Salt N' Pepa On FallonSarah Paulson has skills!
Shawn Mendes Pokes Fun of Jimmy Fallon on 'The Tonight Show'Mendes couldn't help calling Fallon a "grandpa" and reminding the host about their age difference.
Ariana Grande Flawlessly Sings "Jason's Song" On "The Tonight Show With Jimmy Fallon"Ariana sported her signature massive ponytail and something new were gold rimmed glasses from what appears to be the 80s.
The Roots Perform 'Mighty Healthy' for Hillary ClintonDuring her appearance on The Tonight Show last night, Hillary Clinton's walk-on music came with a wink and a nod.
Ariana Grande and Jimmy Fallon Do Not Know Each Other at AllOn The Tonight Show, Jimmy Fallon and Ariana Grande cut through the BS artifice to reveal how much they have to learn about each other's interests, preferences and lives. Welcome to the "Best Friends Challenge."
Hilarious First Date TweetsCheck out these hilarious first date tweets with Jimmy Fallon! #WorstFirstDate
Celine Dion Does Rihanna, Sia & More On 'Fallon'It should come as no surprise that when Celine Dion appeared on The Tonight Show starring Jimmy Fallon last night she was invited to play "Wheel of Musical Impressions" with him.
Ariana Grande And Jimmy Fallon Have A "Lip Sync Conversation" On Tonight ShowAriana Grande is known for her incredible pipes, but she was an actress on Nickelodeon prior to her pop career taking off.