Surprise! Taylor Swift and Zayn Malik just dropped a duet for ‘Fifty Shades Darker’ soundtrack

That sound you just heard was Taylor Swift blowing your mind.

After a month in which she and Drake may or may not have been dating and may or may not have been collaborating (the verdict appears to be no in both cases), Swift just pulled off a surprise. She dropped a new song Thursday night that indeed featured a special guest, just not the one people had been expecting.

Zayn Malik – former member of One Direction, current boyfriend of Swift squad member Gigi Hadid – joined Swift on “I Don’t Wanna Live Forever,” a track from the upcoming “Fifty Shades Darker” soundtrack.

Though the collaboration was done on the down low, the accompanying social media push announcing it was not, with both Swift and Malik posting about the song, as well as Hadid and Lena Dunham, whose longtime boyfriend and Fun. lead guitarist Jack Antonoff co-wrote the song.

Swift and Malik’s collaboration will appear on the “Fifty Shades Darker” soundtrack. If it’s anything like the soundtrack for its predecessor, “Fifty Shades of Grey,” it’ll be a commercial juggernaut. The first one sold more than 2.2 million copies, bolstered by sultry hits from the Weeknd, Beyonci and Ellie Goulding.

“I Don’t Wanna Live Forever” is available on iTunes. “Fifty Shades Darker” will be released Feb. 10.