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Phineas and Ferb Mash-Up Taylor Swift's 'I Knew You Were Trouble'

Phineas and Ferb Mash-Up Taylor Swift's 'I Knew You Were Trouble'
Taylor Swift and Perry the Platypus, from Phineas and FerbKevin Mazur/WireImage; Disney
The stars of the Disney Channel's Phineas and Ferb have gotten into some "Trouble" with Taylor Swift.

Using clips from the animated series, the Dr. Doof character sings to Perry the Platypus in a cleverly silly mash-up music video set to the pop star's hit, "I Knew You Were Trouble."

The video premieres Friday at 8 p.m. ET on the "Gravity Falls" episode.

We're told the song is a great fit for the relationship between the two characters, as Perry always finds a way to thwart Dr. Doof's evil plans.

Following the video's debut, it will be available on the Disney Channel website.

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