Calvin Harris calls out Taylor Swift on Twitter following pseudonym rumors

Calvin Harris called out Taylor Swift on Wednesday after the singer's rep confirmed bubbling rumors that she actually wrote the lyrics to Harris' hit "This Is What You Came For" under a Swedish pseudonym.

After confirming the rumors himself by responding to a tweet by People magazine -- and calling Swift an "amazing lyric writer" in the process -- Harris didn't mince words when it came to Swift's recent shenanigans.

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

"I wrote the music, produced the song, arranged it and cut the vocals though," he said. "And initially she wanted it kept secret, hence the pseudonym."

Harris went on to point to Swift's previous feud with Katy Perry, who she famously wrote "Bad Blood" about for her last album, 1989. Perry called Swift "Regina George in sheep's clothing" for her sweet delivery but allegedly backhanded callouts of fellow celebrities.

See photos of Calvin Harris and Taylor Swift together:

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

He went on to call Swift's efforts to make him "look bad" extremely "hurtful" and asked her to focus on her relationship with Tom Hiddleston instead.

Read all of his tweets below:

UPDATE: Katy Perry has seemingly responded to the social media firestorm that ignited earlier in the day when Calvin Harris took Taylor Swift to task, namedropping Katy in the process. She simply tweeted a gif of Hillary Clinton, of who Perry is an outspoken supporter, raising an eyebrow, which seems to be a sort of "I told you so" from Perry:

RELATED: All of Taylor Swift's famous boyfriends ranked:

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