The 23-year-old has already shot for a high profile advertising campaign with the brand's creative director Karl Lagerfeld. The campaign will be released in 2014, reports vogue.co.uk.
The "Twilight" actress also showed her support for Lagerfeld by flying out to Dallas by private jet at his Coco Chanel Métiers d'Art fashion show Tuesday.
She wore a high-waist orange leather trousers with a cropped long-sleeved top from the spring/summer 2014 Chanel show for the event.
This will mark the second modelling job for Stewart, who is already the face of Balenciaga fragrances.
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