You won't believe how much fun it is to watch them all wig out.
Plus, check out the 'Guardians of the Galaxy' star show off his Kim Kardashian impression!
The actress managed to hold it together during her performance of the emotional song.
Dakota Johnson got a little too into a game during her appearance on "The Tonight Show Starring Jimmy Fallon" on Wednesday night.
The 'SNL' alums went head-to-head to see who could win the most puppies!
'The Tonight Show' host teamed up with Big Bird, Elmo and Cookie Monster.
On Wednesday's episode of 'The Tonight Show,' the 31-year-old reality star admitted she doesn't work well under pressure!
The reality star teased her brother-in-law's new album on the late-night show on Wednesday.
Bob Greenblatt did admit that there have been 'conversations' about the late-night host's health and safety.
Fallon reveals that he and the star use to email each other funny jokes.
See how the late night host shows off his New York pride!
The director of The National Institute of Anthropology and History tells ET what went down... literally.
The rapper and 'The Tonight Show' host bumped into each other in Jamaica.
The 'Tonight Show' host and actor joined the musician in a rendition of his doo-wop hit 'The Longest Time.'
