A topless Kristen Stewart seemed confident and comfortable posing in front of cameras for a new Balenciaga Rosabotanica ad campaign.

The 23-year-old actress and spokeswoman for the brand stripped down for the sexy Balenciaga's fragrance line shoot. [See photos.]

In a behind-the-scenes video, the "Twilight" star, who is seen adorned with flowering vines while posing with an over-sized bottle of Rosabotanica, opened up about the character she plays in Balenciaga's scent "story."

"It's very much in keeping with the story," the "Snow White and the Huntsman" explained in the video, reports US Weekly.

"In the first one, it was very fresh. It was really clean and very bare in your face. 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 world for so long, now who's looking at me?'"

She continued saying, "It looks like the vines are starting to grow into her and they're becoming a part of her," Stewart said describing her character. "She's clearly very comfortable there and owning it a little bit more."

In another shot, she is wearing a low-cut black dress showing off her cleavage.

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

Last month, she struck another fashion deal as a star in Chanel's Métiers d'Art Paris-Dallas 2013-2014 collection campaign, reports Entertainment Weekly.