Cindy Ord/MG25/Getty Images Kylie Jenner is officially in her music era. The Kylie Cosmetics founder, 28, dropped her musical debut, a song called "Fourth Strike" in collaboration with pop duo Terror Jr, at midnight on Tuesday, October 14. Jenner is credited as King Kylie, the alter ego she first introduced to the world over a decade ago, and is featured on a verse near the end of the song. "One strike, two strike, let me get the mood right / I just wanna tell you I'm sorry," Jenner sing-speaks over mid-tempo R&B beats. "Touch me baby, tell me I'm your baby / Write your name all over my body.