Arthur George
is a family affair!

The youngest stars of "Keeping Up with the Kardashians," Kendall and Kylie Jenner, are Rob Kardashian's newest models for his Arthur George sock line.

While modeling socks doesn't really fall in line with Kendall's aspirations for high fashion work, it's nice to see the Jenner girls help out their big brother.

In the promotional pics above, Kendall, 17, and Kylie, 15, sport the colorful footwear .... along with some pretty short shorts.

While Rob's publicly struggled to find his own professional calling, it looks like the 26-year-old is finally making some headway --  Arthur George socks and leggings are currently available online and at Neiman Marcus.

Click "Launch Gallery" above to see all the photos from the shoot and some behind-the-scenes candids of siblings on set! 

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