Songstress Taylor Swift has shaken off her girl next door image by posting a sexy snap to wish collaborator Zayn Malik happy birthday. As Zayn turned 24, Taylor shared an Instagram shot, along with the caption “HAPPY Z DAY.”

In the sensual snap, the two are seen in silhouette. It is understood that the shot is a still from their duet I Don’t Wanna Life Forever, which is part of the soundtrack for the new Fifty Shades Darker movie. The pair are seen standing back to back, while bathed in a blue light.

Taylor co-wrote the track along with Jack Antonoff, who is the boyfriend of Lena Dunham, and Sam Dew, who wrote LoveHate Thing. Some filming of the video has already taken place at the St Pancras Renaissance London hotel. According to reports, the pair had to trash a hotel room for the video. The hotel even turned off its sprinkler system and smoke alarms to allow them to set a pair of curtains on fire.

Sexy video

The video is reported to be very sexy, with Zayn dressed in a suit, while Taylor is in lingerie and high heels. Zayn was spotted heading to Nando’s after the shoot, but Taylor had to fly straight to Nashville. The track, and video, has been laid down as part of the Fifty Shades trilogy. Fifty Shades Darker is the second installment and is due to open on February 10 in movie theatres in both Britain and America.

Author EL James is also understood to be in talks with top theatre producers to bring Fifty Shades to the stage. According to sources, she has already held high level discussions aimed at bringing a stage version of the franchise to Broadway and the West End. Theatre producers are understood to be convinced that a stage version would prove to be an instant hit.