The two superstars decided to surprise fans in the biggest way -- by releasing a HOT collaboration no one saw coming.
Late on Thursday, the two dropped the track I Don't Wanna Live Forever for the upcoming Fifty Shades Darker.
Zayn previewed the duet by posting a black and white pic of himself with Swifty on his Instagram -- but hey, she is bestiez with his girlfriend Gigi Hadid, so it wouldn't be unusual that they hang out... But collab?!
Well, if he listens to it, we think he'll think it's a pretty hot and sexy winner.
Ch-ch-check out the I Don't Wanna Live Forever sneak peek (below)!!!
[Image via Instagram.]