Paul McCartney and Taylor Swift performed together at the SNL 40 Afterparty.

Saturday Night Live celebrated it's 40th anniversary last night with a star studded 3 and a half hour special.  At the after party, the craziness continued with performances by Paul McCartney and Taylor Swift together, as well as Prince with Haim, Win Butler, Bill Murray, and Jimmy Fallon. Watch below. If you missed SNL40, you can also see our 10 favorite SNL Skits of all time.

A video posted by Danielle Flora (@daniellehasenflora) on Feb 15, 2015 at 11:04pm PST

Dude....this really really really really happened #O!!!!!!!!!! #SNL40 #SNL40afterparty

A video posted by Questlove Gomez (@questlove) on Feb 16, 2015 at 1:53am PST

And then prince. With jimmy fallon Martin short and Chris rock. #snl40

A video posted by djcassidy (@djcassidy) on Feb 16, 2015 at 1:41am PST