Surprise! Taylor Swift Co-Wrote Calvin Harris’ “This Is What You Came For” (And Sang On It Too)

Harris admitted Swift “smashed it as usual”… before shading her something fierce.

Rumours that Taylor Swift helped pen Calvin Harris and Rihanna’s smash collaboration “This Is What You Came For” under a pseudonym have been confirmed by the singer's reps, Rolling Stone reports.

They revealed that Swift was indeed the Nordic-sounding songwriter “Nils Sjoberg” listed in the writing credits for the tune.

Harris also chimed in on Twitter to credit Swift appropriately, adding that “she sings on a little bit of it too”.

And she sings on a little bit of it too 🙃
Amazing lyric writer and she smashed it as usual https://t.co/vW3yGOIJit

— Calvin Harris (@CalvinHarris) July 13, 2016

Buuuuut, Swift’s ex wasn’t interested in remaining magnanimous for long, suggesting that the revelation of her involvement now is a slight to their fractured relationship.

Hurtful to me at this point that her and her team would go so far out of their way to try and make ME look bad at this stage though 🤔

— Calvin Harris (@CalvinHarris) July 13, 2016

I figure if you're happy in your new relationship you should focus on that instead of trying to tear your ex bf down for something to do

— Calvin Harris (@CalvinHarris) July 13, 2016

I know you're off tour and you need someone new to try and bury like Katy ETC but I'm not that guy, sorry. I won't allow it

— Calvin Harris (@CalvinHarris) July 13, 2016

You know, this feels like the kind of late-night Tweeting that someone regerts in the cold light of morning and deletes, so just in case, here are the screencapped Tweets.

Katy Perry, who - you hardly need reminding - was infamously the subject of Swift’s “Bad Blood”, subtweeted something fierce.

She also retweeted the following, from the heat of the “Bad Blood” controversy.

No matter who you side with in this fracas, there’s one inarguable fact all parties must contend with: Swift is making beaucoup bucks off the back of “This Is What You Came For”.

So, who’s the real winner?

BLEACHELLA ⚡️

A photo posted by Taylor Swift (@taylorswift) on Apr 15, 2016 at 1:09pm PDT

Photo: ABC.