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: Jimmy Fallon Reads #IfIWonThePowerball Hashtag TweetsTonight Show host Jimmy Fallon asked his viewers to tweet what they'd do with the cold, hard cash.
Jimmy Fallon Reads #WorstLieIEverTold Hashtag TweetsDang...these fibs are SAVAGE!
WATCH: Michelle Obama Writes Thank You Notes With Jimmy Fallon"Thank you, Barack, for proving you're not a lame duck – but my very own silver fox," FLOTUS quipped.
Paul McCartney Joins Fallon, ‘Sing’ Cast For ‘Wonderful Christmastime’Cast members from the new movie 'Sing' were joined by none other than the songwriter himself.
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.
WATCH: David Blaine Stuns Jimmy Fallon With Magic TricksBlaine pulled off an illusion no one saw coming and you just gotta see it to believe it.
Perez Hilton's Daily Update: Britney Spears Is Collaborating With Tinashe For Her Next SingleBritney Spears is keeping the "Glory" momentum going with fire collaborations.
Justin Timberlake Joins Jimmy Fallon at Camp in ‘Tonight Show’ SkitThe two friends decide to sing a song they heard on the radio earlier that day — “Ironic” by Alanis Morissette.
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.
WATCH: Kevin Hart Roasts Dwayne 'The Rock' Johnson For Driving On SetDwayne "The Rock" Johnson is one of the strongest men in Hollywood, but don't you dare ask him to walk 100 feet!