Kristen Stewart lost her top once more in a new ad for Balenciaga's perfume line.

The Twilight star signed with Balenciaga back in the summer of 2012, and has since released two bare-skinned adverts for the French fashion house. Cropped just high enough to protect the 23-year-old's modesty, Stewart's latest photo (see image here) promotes the Rosabotanica fragrance and follows last summer's Florabotanica promotion.

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Stewart explained the artistry of the grey-scale, floral-infused images in a new behind-the-scenes video from her most recent photo shoot.

"In the first one it was very fresh, it was really clean and very bare, in your face," Stewart said. "In this it's a little more lived in, it's like she knows the environment so well that when the lens steps in to take a look at her it's like, 'I've been here in my own world for so long, now who's looking at me?'"

As the On The Road actress posed with the intricate vines creeping up her arm and across her chest, Stewart was relaxed enough to crack an elusive smile for the cameras.

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"What I like about this is that I didn't have to turn into a different person," Stewart explained. "The point was to capture something natural. If you feel like you're forcing something, or trying to get the shot, suddenly, it's not fun anymore."

Stewart's latest film project, Camp X-Ray, is headed for the Sundance Film Festival this spring.