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Things got extra shady on Twitter on Tuesday when Calvin Harris teased the list of upcoming collaborators from his new album. 

In a video posted on Twitter, the music producer teased his album, Funk Wav Bounces Vol. 1

The list of featured artists includes Nicki Minaj, Ariana Grande, Snoop Dogg, Frank Ocean and, yes, Katy Perry. 

For those blissfully unaware of why this is a big deal, Harris used to date  Perry's frenemy Taylor Swift. 

Well, Swift's fans — who are called Swifties — took notice of this impending collaboration and felt very strongly about Perry teaming up with Swift's former boyfriend. 

According to a flurry of tweets, the Swifties found it shady that Perry and Harris were working together. They predict this collaboration will flop and that Swift will come out on top:

While Swift's fans were having a meltdown over the collaboration, others were living for the pettiness of Perry and Harris teaming up:

Your move, Taylor. 

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