She's only 17 and already Kendall Jenner is making her big sis Kim Kardashian "jealous" with her new photo spread for Australia's Miss Vogue magazine. The Keeping Up with the Kardashians star showed lots of leg for her racy photo shoot that's sure to have many asking the question: "Is this age appropriate?"

Regardless, 31-year-old Kim, who covered L'Uomo Vogue back in July, was proud of her teen sister, tweeting her support: "The Miss Vogue shoot @kendalljenner shot is stunning."

Jenner's other older sister Kourtney Kardashian was equally thrilled with the spread, adding via Twitter: "I AM OBSESSED WITH YOU KENDALL! WOW. Breathtaking."

The Vogue photographer Russell James also gushed over the reality star, tweeting: "Congrats @KendallJenner on your Ms VOGUE cover. Rare few models make it Vogue ever-especially by age 17!"

What do you think of Jenner's Vogue shoot? Is she too young for such mature photos?