Taylor Swift Breaks Up With Her Musical Pseudonym ''Nils Sjoberg'' for Calvin Harris Song ''This Is What You Came For''

Does this mean a legal battle is looming?

Well, since the cat's out of the bag, Taylor Swift doesn't seem to find a need for "Nils Sjoberg" anymore.

E! News has confirmed that the singer ditched her pseudonym for her ex-boyfriend Calvin Harris' hit song "This Is What You Came For" after admitting that she was actually the one to collaborate with her former beau on the Rihanna track.

According to BMI's repertoire, which is what protects licenses for songwriters, what once said "Nils Sjoberg" under songwriter/composer now says Taylor Swift, along with Harris. However, the music producer is represented by ASCAP, which still lists Sjoberg as the songwriter.

"Taylor Swift wrote 'This Is What You Came for' under the pseudonym Nils Sjoberg," the pop star's rep previously told E! News, confirming a fan rumor. E! News also learned Swift came up with the melody.

However, following the reveal of her alias and actual collaboration, Harris took to Twitter to vent about the entire situation and her decision to let everybody in on their secret.

"And she sings on a little bit of it too...Amazing lyric writer and she smashed it as usual. I wrote the music, produced the song, arranged it and cut the vocals though. And initially she wanted it kept secret, hence the pseudonym," Harris tweeted.

"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," he added.

E! News also learned that Swift was hurt by Harris' interview at the time of the release, where he told Ryan Seacrest that he didn't see himself teaming up with Taylor for any possible music projects in the future, saying on the radio show On-Air With Ryan Seacrest that he and Swift had never spoken about a music collaboration, but, "I can't see it happening, though."

"Adam and Swift did get in an argument about this but Adam was very hesitant in working with Swift on music because his past experience with his other girlfriend," a source told E! News exclusively, referring to Rita Ora. "He thinks Taylor is a talented artist but he wanted going forward to keep his relationship and work separate. He apologized if she took anything to heart but has only respected her throughout their relationship."

Looks like they ended up getting into a messy situation, regardless.