"I Knew You Were Trouble" (stylized as "I Knew You Were Trouble.") is a song recorded by American singer-songwriter Taylor Swift for her fourth studio album, Red (2012). It was released on October 9, 2012, by Big Machine Records, as the third promotional single from the album. It was later promoted as the third single from the album on December 10, 2012. As the fourth track on Red, the song was written by Swift, Max Martin and Shellback, with the production handled by the latter two. "I Knew You Were Trouble" has been described as a "kiss-off" and "breakup banger" with an uptempo pop rock, electropop, and dance-pop sound, with strong influences of dubstep. Its lyrics detail a toxic relationship.
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