Model Behavior: Celebrities in Fashion Ads

Despite protests from Adidas-affiliated brother-in-law Kanye West, Kylie Jenner made her modeling debut for Puma in an ad for the athletic brand's Puma Fierce sneakers in March 2016. In the ads, the 18-year-old model and reality star poses in blue spandex and a sports bra, showing off a black pair of the Puma Fierce kicks, which will be released on April 1.

The actress was named the new face of Chanel's 2016 Eyes Collection campaign in February.

"With her modern, magnetic beauty, and free spirit, Stewart appears in a series of portraits embodying various facets of the contemporary Chanel woman," the company said in a statement.

The Game of Thrones star left the dragons at home for a revealing ad for Dior’s Rose des Vents fine jewelry collection. Clarke wore an unbuttoned white shirt and long gold necklaces in one of the shots from her debut campaign for the French fashion house.

The "Stay With Me" singer seems to be channeling his inner mime in his first men's campaign feature for Balenciaga's Men's Fall/Winter 2015 campaign.

The "Dark Horse" singer is ready for Christmas in July. Perry will be featured in H&M's "Happy and Merry Holiday" campaign launching later this year.

The 16-year-old daughter of Johnny Depp and Vanessa Paradis is the new face of Chanel's Pearl eyewear collection.

The reality stars are the very definition of a sister act in a new Balmain ad campaign.

Seeing as the "Dark Horse" singer is practically besties with Moschino creative director Jeremy Scott, it's no surprise that she's been tapped to be the new face of the eclectic high-fashion brand. "THE FACE OF MOSCHINO," Katy excitedly Instagrammed on June 10, alongside this picture of her rocking a shiny gold bra top in her very first ad.

The "Whip My Hair" singer is the newest face of Marc Jacobs! The stylish 14-year-old gives a fierce pose in her first ad for the designer's Fall 2015 campaign, shot by photographer David Sims. Willow joins Cher as the latest celebrities chosen to represent the celeb-friendly line. 

RiRi posted a picture from her highly anticipated Dior campaign on Instagram on May 14. The "Secret Garden" campaign shots showcase the singer as the first black woman to be the face of the french label.

The Twilight star poses as a photojournalist in Chanel's latest ad campaign, showing off their spring-summer 2015 eyewear collection.

Known for wearing many hats, the singer is also the creative director and model for Puma's athletic wear and Pulse XT sneakers in their newest ad. The pic is captioned, "An icon who does it all needs a shoe that can keep up."

The Hunger Games star has appeared in multiple campaigns for Dior.

Karl Lagerfeld shot Stewart for the new Chanel 11.12 handbag campaign.

Julia Roberts posed for Givenchy's Spring 2015 campaign.

Wilde was announced as the face of H&M's Conscious Exclusive campaign in Dec. 2014.

Portman is the face of Dior's "Miss Dior" fragrance in a short film and print ads.

Knightley is the current spokesmodel for Coco Mademoiselle by Chanel.