Dakota Fanning

Mark Sullivan/WireImage.com

Dakota Fanning is all grown up!

It's hard to believe, but the kid who initially made her way into our hearts playing Sean Penn's adorable daughter in 2001's I Am Sam turns 18 today.

Over the years, the actress has not only impressed us with her work in such movies as War of the Worlds, The Runaways, the controversial Hounddog and a little film franchise known as The Twilight Saga, but she's also managed to remain pretty grounded despite all the fame.

So, to celebrate her big day, we've put together a gallery highlighting some of Dakota's best big-screen moments. Check it out!

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