The actress, 28, is the latest celebrity to represent Christian Dior.
"I am absolutely thrilled to be working with Dior," Kunis said in a statement. "The brand is iconic in so many ways. It defines fashion, elegance and sophistication."
The actress, who joins fellow A-listers Marion Cotillard, Charlize Theron and Natalie Portman as a rep for the luxe French fashion house, will appear in the spring fashion campaign for the Miss Dior handbag shot by Mikael Jansson and slated to break this month in international editions of Elle, Vogue and Madame Figaro.
And while Kunis told WWD that she's still "just learning about fashion" and confessed to being more of a "jeans and T-shirt" type, she's excited to get decked out Dior's elegant designs.
"In my daily life, I don't wear the most feminine pieces," Kunis revealed. "But I love to feel feminine when I'm on the red carpet." She added: "I find that Dior is an incredibly grounded house. I always thought what Dior does is so sophisticated, feminine and beautiful."
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