Kylie and Kendall Jenner showed their support for their big brother, Rob Kardashian by posing for his Arthur George line. 

The "Keeping Up with the Kardashians" stars took off their pants and modeled colorful designer socks for a new ad campaign, according to JustJared Jr. 

"We are so proud of [our brother] Rob for creating this amazing sock line and we had so much fun at the photo shoot!," Kylie, 15, and Kendall, 17, wrote on their Celebuzz blog. There are so many vibrant and bold-colored styles available, with more arriving in Neiman Marcus stores on July 1. 

For the sock-it-to-me photos, click HERE. 

But the teenagers were not the only proud ones. Their mother, Kris Jenner offered up her congratulations. 

"Love this photo shoot for @Arthurgeorgesocks proud of you @RobKardashian," the matriarch posted on Instagram, uploading some shoot pictures. 

In one picture, the girls join two other female and one male model rocking white cotton tees and solid socks while sitting. In another photo, the group of five stand up in a row while wearing a mix of petal pink and white dress shirts and colorful, patterned knee socks. 

It was quite a "Risky Business" shoot, reminding people of the iconic look that Tom Cruise sported in the film, according to Hollywood Life.

They wore oversized shirts, leaving their signature brunette locks down with natural makeup in the shots. The shoot and line reviews have been positive.

"There is a very sexy, fun and laid back vibe that we're really loving from the line," said HL. "At first, Rob insisted he wanted the socks to be statement pieces that bring more personality to formal wear, however, we think the 'Risky Business' take works even better!"

Like the socks and campaign photos? Tell us below!