Justin Timberlake and Jimmy Fallon reunited on Tuesday

Third times a charm!

Get Your Fan Questions In Now At 1-877-AT40 FAN

Check in at GletGlue this weekend unlock the Jimmy Fallon AT40 Takeover sticker!

Michael Buble and Jimmy Fallon make a great comedic duo!

Check out the hilarious video!

Check out the hilarious video!

Jimmy's new musical comedy album "Blow Your Pants Off" drops June 12th!

Check out the 'Call Me Maybe' spectacular featuring classroom instruments!

Fallon and the cast of his new show, Guys With Kids performed the medley on his show Tuesday night

Only Xtina could make this sound so awesome!

The country star blows us away on the late night show with her country rap duet with Jimmy Fallon, and her performance on the show

The group breathes new life into a Christmas classic

They done it again!

Check out 'Mario Kart Love Song'

Fallon said Im really excited to host a show that starts today instead of tomorrow