VIDEO : Taylor Swift, Zayn Malik Join Forces on 'Fifty Shades Darker' Duet

American pop star Taylor Swift and former One Direction member Zayn Malik released a surprise duet on Friday, joining their musical abilities for the upcoming "Fifty Shades Darker" movie soundtrack. Swift informed fans of the collaboration on Instagram, posting a picture of what appeared to be the single cover and a message reading "Z T 50". She also posted a video of the song.