The former child star, who turned 17 in April, turned heads at the premiere of "August: Osage County" in Los Angeles on Monday night -- where she stepped out wearing a striped silver and sheer gown that accentuated her figure.
Sporting a fishtail braid and heels, the glam actress looked far removed from the "Little Miss Sunshine" alter-ego we came to know and love back in 2006.
It's definitely a bold look, but we think she pulls it off. And we can't wait to see more of her on the red carpet in the future!
But what do you think? Sound off in the comments below -- and see how more former child stars aged in the gallery above.