Kendall Jenner sure doesn't look like most 15-year-olds.

Clad in heavy makeup and skimpy hot pants, the aspiring model recently vogued for the cameras as the face of Marc Clark's new T-shirt line.

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"I know I say it all the time, but I swear, she gets more and more professional with every shoot she does," half-sister Khloe Kardashian blogged Monday. "It just blows my mind that both she and Kylie have transformed from my baby sisters into these beautiful young women."

VIDEO: Dad Bruce Jenner defends Kendall's racy photo shoot

Khloe, 26, isn't the only family member floored by Kendall's grown-up photo shoot: Kim Kardashian also raved about Kendall -- who raised eyebrows after she posed in a skimpy string bikini over the summer -- by calling her a "true pro."

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"I'm obsessed with these shots of Kendall," Kim, 30, gushed. "I swear she just gets more stunning with each photo shoot!"

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