Kristen Stewart goes topless and cracks a rare smile in behind-the-scenes video of her Balenciaga Rosabotanica advert

She first went topless for a racy car scene in the 2012 drama On the Road.

And Kristen Stewart stripped down again, this time for Balenciaga, in the French fashion house's perfume campaign for Rosabotanica.

In a new behind-the-scenes video, the 23-year-old actress wore little more than intricate flowers and vines affixed to her torso, back, and arms.

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Sex sells: Kristen Stewart went topless in the new campaign for Balenciaga's perfume Rosabotanica

As the make-up artist placed the artwork directly on the Twilight starlet, it resembled a three-dimensional tattoo. 'It looks like the vines are starting to grow into her and they are becoming a part of her and she's clearly very comfortable there and owning it a little bit more,' Kristen tells the camera. The tomboyish performer - who normally avoids florals - easily transformed into an ethereal mother nature of sorts.

Blooming: In a new behind-the-scenes video, the 23-year-old actress wore little more than intricate flowers and vines affixed to her torso, back, and arms

Fits her persona: As the make-up artist placed the artwork directly on the Twilight starlet, it resembled a three-dimensional tattoo

'It looks like the vines are starting to grow into her': The tomboyish performer - who normally avoids florals - easily transformed into an ethereal mother nature of sorts Pretty: The Runaways star's made-up skin looked breathtakingly dewy and fresh as she posed with the perfume bottle Flawless: Kristen's brunette locks were swept into a romantic updo and there was a lovely brown shadow, which brought out her green eyes Describing her character, Stewart said: 'It's like she knows the environment so well that when the lens steps in to look at her it's like, "I’ve been here for so long, now who is looking at me?"' The Runaways star's made-up skin looked breathtakingly dewy and fresh as she posed with the perfume bottle. Kristen's brunette locks were swept into a romantic updo and there was a lovely brown shadow, which brought out her green eyes.

She has teeth! The Panic Room actress even cracked a rare smile during the shoot as she posed in a plunging black gown

'What I like about this is that I didn't have to turn into a different person': The LA-born beauty has represented Balenciaga for two years Rosabotanica smells like: The fragrance contains hints of hyacinth, fig leaf, grapefruit, pink pepper, cardamom, cedar wood, and patchouli

Kristen said: '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' The Panic Room actress even cracked a rare smile during the shoot as she posed in a plunging black gown. 'What I like about this is that I didn't have to turn into a different person,' Stewart said. '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.'

The end result: Kristen stars in the French fashion house's perfume campaign for Rosabotanica

In demand: The unlikely fashionista will next join up with Karl Lagerfeld to shoot Chanel's country-western pre-fall campaign, which launches in May

The LA-born beauty - who's represented the brand for two years - was cross-cut with perfumers Jean-Christophe Herault and Olivier Poige speaking about the fragrance in French.

It contains hints of hyacinth, fig leaf, grapefruit, pink pepper, cardamom, cedar wood, and patchouli.

The unlikely fashionista will next join up with Karl Lagerfeld to shoot Chanel's country-western pre-fall campaign, which launches in May.

Marylou in the middle: Kristen first went topless for a racy car scene in the 2012 drama On the Road alongside co-stars Garrett Hedlund and Sam Riley

Kristen will next play a soldier in the Guantanamo Bay drama Camp X-Ray, which premieres at the Sundance Film Festival on January 17.

This year, she'll also star in the drama Anesthesia with Glenn Close and the drama Sils Maria with Chloe Grace Moretz..