Katy Perry is about to make her feud with Taylor Swift a lot worse. The pop star has the hots for Calvin Harris, T-Swift’s ex, after working with him on the song “Feels.” “Katy and Calvin haven’t always been on the best of terms,” an insider told In touch, “But she saw a totally different side of him when they worked together on their hit song ”Feels.”

Now, according to the source, Katy is “telling friends that she’d love to go on a date with him.” Katy and Calvin had a falling out in 2011, after the DJ canceled plans to open for Katy on tour last minute. He then, of course, later dated her no. 1 nemesis Taylor.

Taylor recently released a song “Look What You Made Me Do” that a lot of people suspect was aimed at Katy. After she hosted the MTV video Music Awards, Katy was spitted at Calvin’s post party. Katy “gets so nervous around Calvin because she thinks he’s so hot and loves his sense of humor,” the insider dished.

They added that Calvin thinks Katy is “really cute and fun.”

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