They collaborated last year on the Fetish music video.

And pop star Selena Gomez has reunited with Petra Collins for a blood-curdling IGTV horror shot called A Love Story.

In a preview montage Petra posted to Instagram on Wednesday, Selena, 25, can be seen bathing with a mask that eerily resembles an actual severed human face.

Masked woman: Pop star Selena Gomez has reunited with Petra Collins for a blood-curdling IGTV horror shot called A Love Story

At one point, the mask is floating at the surface of the water, and Selena slowly leans down toward it, her face so near it she appears about to kiss it.

During other snatches of the music video, the mask is positioned on Selena's arced back, eventually sliding down into the murky water.

One particularly striking shot shows Selena lounging in the tub in the bathroom - while in an adjoining room, a prosthetic of a headless, limbless torso sits on a chair.

In repose: During other snatches of the music video, the mask is positioned on Selena's arced back, eventually sliding down into the murky water

Bizarre: In a preview montage Petra posted to Instagram on Wednesday, Selena, 25, can be seen bathing with a mask that eerily resembles an actual severed human face

So strange: At one point, the mask is floating at the surface of the water, and Selena slowly leans down toward it, her face so near it she appears about to kiss it

In other bits of the video, which Petra posted to her Insta Stories, Selena settles down to a bit of cake, but in an unorthodox manner.

Settling down in a dimly candlelit room, she shaves one of her legs with frosting instead of shaving cream and then eats the result.

She also glares through a window and brandishes the blade, modeling a Little House On The Prairie chic white dress with lace accents.

Wow: One particularly striking shot shows Selena lounging in the tub in the bathroom - while in an adjoining room, a prosthetic of a headless, limbless torso sits on a chair

Chowing down: In other bits of the video, which Petra posted to her Insta Stories, Selena settles down to a bit of cake, but in an unorthodox manner

Petra revealed on Instagram that photographer Moni Haworth, set designer David James With and prosthetic sculptor Sarah Satkin had worked on A Love Story.

Selena, executive producer of the Netlfix series 13 Reasons Why, has her third solo studio album in the works.

She has dished to Billboard: 'This has been building for maybe two years. I was really happy with Revival but at the same time, I was terrified of doing another record.'

The Texas-born songstress said: 'Because for me, it could be like it was a step down or I needed to beat that record, and I think every artist kind of struggles with that. So I waited. I wanted it to be great, and had I not waited a good year or two, I wouldn't have had the best songs I've ever had.'

Bon appetit: Settling down in a dimly candlelit room, she shaves one of her legs with frosting instead of shaving cream and then eats the result