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Taylor Swift, Paul McCartney and Jimmy Fallon

Have you all heard of this guy Paul McCartney? With the people he's hanging out and collaborating with, he's seriously blowing up right now.

The 40th anniversary special of Saturday Night Live saw a lot of great musical acts, from Kanye and Sia to Justin Timberlake and Jimmy Fallon. But a lot of the REAL action happened onstage during the event's after-party.

The former Beatle took to the stage to have a jamming session with Jimmy Fallon, Dan Aykroyd, and resident superstar/fangirl hybrid Taylor Swift. Folks in the crowd managed to get some shaky footage of them all rocking out to the Beatles' classic "I Saw Her Standing There". We definitely wouldn't have been able to keep still either.

 

@daniellehasenflora: Singing “When I Saw Her Standing There” at the SNL 40 after party #taylorswift #SNL40afterparty #updates

A video posted by Taylor Swift Updates/News (@dailyswiftnews) onFeb 16, 2015 at 12:21am PST

And it didn't stop there. Tay also took centre-stage, with Paul Freakin' McCartney on backing guitar, to give that lucky, lucky crowd a live rockin' rendition of "Shake It Off":

Look at the way she signals to Paul for the chord change, and he just nods. Life goal right there. 

Someone even managed to nab some footage for Tay herself to use, which she giddily posted last night:

In fact, there are so many 15-second Instagrams out there of this performance that we can almost piece together the entire song.

 

@briadezzu: paul tho. that is sir paul. #taylorswift #SNL40afterparty #updates

A video posted by Taylor Swift Updates/News (@dailyswiftnews) onFeb 16, 2015 at 8:39am PST

AND IT DIDN'T STOP THERE.

The party just kept on going with Prince emerging out of nowhere to cut loose and play "Let's Go Crazy":

 

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

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

And any pretence of the stage being a Performers Only spot was abandoned when he was joined onstage by EVERYONE, from Chris Rock and Martin Short to the girls from HAIM.

 

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

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

 But no New York party is complete without an impromptu crash from Bill Murray. And here he is, completing the set, doing the tambourine.

 

Bill Murray casually on tambo. #snl40

A video posted by djcassidy (@djcassidy) onFeb 16, 2015 at 1:36am PST

Music goals. Party goals. LIFE GOALS.

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