Taylor Swift Played "Shake It Off" With Paul McCartney & Jimmy Fallon

If you're wondering why Miley Cyrus got to sing during the Saturday Night Live 40th Anniversary Special and Taylor Swift didn't, bear with us. If you're wondering why Paul McCartney is the hottest act in the world right now, it's because he was in the freaking Beatles and he's earned it, you little whippersnapper. 

Swift
can hardly complain. The pop star appeared in a sketch during the special. Then she went to the after-party and, according to party guest Jessica Seinfeld, jumped on stage to perform "Shake It Off." Who's that performing next to her as she wails on the guitar? Oh, just Macca and a very enthusiastic Jimmy Fallon. 

Lest you were still in doubt that you missed perhaps the best party of all time, consult the Instagram feed of DJ Cassidy. Turns out Prince also jammed on stage with, let's see, Chris Rock, Este from Haim, Martin Short, Maya Rudolph, and Fallon. Yep, that's Bill Murray on the tambourine.   

Guys, guys. Are you all going on tour, or what?
OPENER IMAGE: Everett Collection/REX USA.