Taylor Swift co-wrote Calvin Harris' 'This Is What You Came For' under Swedish pseudonym

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Is Calvin Harris Putting Ex Taylor Swift on Blast in New Song?

Calvin Harris and Taylor Swift may be over, but TSwift's influence on his life continues in an unexpected fashion. While the jet-setting couple called it quits after almost a year, a rep for Swift confirmed to Billboard that she was the co-writer of Harris' global smash with Rihanna, "This Is What You Came For," which she penned under the pseudonym "Nils Sjöberg."

TMZ reported that Swift wrote the song at a piano and made a demo on her iPhone, which she then sent to Harris, who reportedly "loved it." An unnamed source close to Swift reportedly told the gossip site that the pair then went into a studio and did a full demo with Swift singing and Harris creating the beats.

According to TMZ, they felt it would be a smash but were afraid that having both their names on it would distract from the music, so Swift agreed to use the pseudonym, retaining the publishing rights to the track that has risen to No. 4 on the Billboard 100. A spokesperson for Harris had not returned requests for comment at press time.

Nils' First World Problems blogger Nils Sjoberg, who happens to share the name, posted a comic about the coincidence, writing, "@taylorswift uses my name (Nils Sjöberg) as an alias when she produce pop songs (it's true, google it!), one of my very own first world problems."

http://nilsfirstworldproblems.tumblr.com/post/145499083770/taylorswift-uses-my-name-nils-sjöberg-as-an

Swifties have been speculating about the song for weeks, with Seventeen magazine noting that at first fans were convinced Taylor provided the "oooh ooh ooh" backing vocals on it, then going into full "Taylor wrote it" mode.

The other evidence Seventeen noted was that at one point Wikipedia listed Swift as the co-writer, then switched it to the pseudonym.

Check out more from the former couple in the gallery below!

17 PHOTOS
Taylor Swift Calvin Harris
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Taylor Swift Calvin Harris
Friendly relations between Scotland and America. @calvinharris
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Little known fact: Karlie is secretly an unofficial historian/London tour guide. Kind of.
NEW YORK, NY - MAY 28: Taylor Swift,Calvin Harris are seen in Tribeca on May 28, 2015 in New York City. (Photo by Alo Ceballos/GC Images)
Photo by: KGC-146/STAR MAX/IPx 5/26/15 Taylor Swift and Calvin Harris are seen in New York City. (NYC)
Photo by: KGC-146/STAR MAX/IPx 5/26/15 Taylor Swift and Calvin Harris are seen in New York City. (NYC)
LAS VEGAS, NV - MAY 17: Recording artists Taylor Swift (L) and Calvin Harris attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015 in Las Vegas, Nevada. (Photo by Kevin Mazur/BMA2015/WireImage)
Taylor Swift, right, hugs Calvin Harris after winning the award for top billboard 200 album for “1989” at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (Photo by Chris Pizzello/Invision/AP)
Taylor Swift, right, hugs Calvin Harris after winning the award for top billboard 200 album for “1989” at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (Photo by Chris Pizzello/Invision/AP)
LAS VEGAS, NV - MAY 17: Recording artist Taylor Swift embraces DJ/producer Calvin Harris after she won the Top Billboard 200 Album award during the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
Taylor Swift, right, hugs Calvin Harris after winning the award for top billboard 200 album for “1989” at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (Photo by Chris Pizzello/Invision/AP)
Taylor Swift, right, hugs Calvin Harris after winning the award for top billboard 200 album for “1989” at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (Photo by Chris Pizzello/Invision/AP)
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