Calvin Harris Rants About Taylor Swift on Twitter

Looks like things are getting ugly between Taylor Swift and her latest ex-boyfriend, Calvin Harris!

On Wednesday, a rep for the “Blank Space” singer confirmed that Swift co-wrote Rihanna and Harris’ hit song “This Is What You Came For” under the pseudonym Nils Sjoberg, according to People.

Harris then took to Twitter upon the release of the news. First, the DJ praised Swift:

But then Harris decided to clarify his part in making the song:

TMZ reports that the Swift wasn’t happy that Harris took most of the credit for the song and was hurt by what he said in an interview with Ryan Seacrest on the day of the song’s release. Seacrest had asked Harris, “Will you do a collaboration with your girlfriend?”

Calvin replied, “You know we haven’t even spoken about it. I can’t see it happening though.”

Harris’ tweets then became more personal, referencing her new romance. Harris and Swift broke up in May, and Swift has already been spotted spending time with Avengers actor Tom Hiddleston.

Harris also brought up the singer’s rumored feud with Katy Perry:

Perry, who didn’t respond directly to the news, tweeted out a Hillary Clinton meme today shortly after Harris’ tweets:

Perry also retweeted a tweet she originally posted a year ago:

Swift has yet to respond to Harris’ rant.