(From left) Alexa Vega in 2002 & on June 26 in an Instagram photo (© Stewart Cook/Rex Features; vegaalexa via Instagram, http://aka.ms/vegabikini)
BAM. This girl once played a kid spy, and we have a feeling that she walked away from her role as Carmen Cortez with more than a few sneaky tricks up her sleeve. Alexa Vega’s beauty at a grown-up 23 can only be rivaled by her stealth, because we really didn’t see that one coming.

13 child stars who grew up unbelievably gorgeous

7/28/2012

Kids — they grow up so fast. From the dorky but loveable Joseph Gordon-Levitt in 90s sitcom "3rd Rock from the Sun" to the adorable Dakota Fanning in "I Am Sam," many of our beloved child stars have since bloomed into, well, extremely attractive human beings. While those like former "Doogie Howser, M.D." star Neil Patrick Harris carry their youthful aura while still managing to be incredibly handsome, others, like Alexa Vega of "Spy Kids," look completely different, and completely sexy.

Look through the gallery above to see the most jaw-dropping transformations in our favorite former-kid stars.

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Which of your favorite child stars did we forget to include in the gallery?