Pop stars Taylor Swift and Zayn Malik wowed fans when they released a surprise duet single. Their new song, "I Don't Wanna Live Forever" is from the "Fifty Shades Darker" soundtrack. Both Swift and Malik took to social media to announce the release of their new song. Shortly afterwoords, the single was available on iTunes. The new track was written by Swift, Sam Dew, and Fun's Jack Antonoff. This wasn't the first time Antonoff and Swift teamed up.