31 Photos of Kendall & Kylie Jenner Through the Years Are Guaranteed to Blow Your Mind

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Keeping Up With the Kardashians premiered in 2007, and formally introduced the world to not only Kourtney, Kim, and Khloe Kardashian, but also the trio's younger sisters Kendall and Kylie Jenner. When the series first started Kendall and Kylie were only 10 and 12 years old, and mainly the comic relief to the family's already wacky antics. Now, each is a celebrity in their own right with their own YA novel, clothing line for PacSun, and modeling careers. And though they've only been in the spotlight for seven years, it's amazing how these girls have grown up over the years — so much so that you might not be able to recognize the Kendall and Kylie from 2007. Check out these 31 photos of the Jenner sisters through the years — you'll be shocked by their transformation.

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