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Blake Lively, Dakota Fanning

Jamie McCarthy/Getty Images; Michael Tullberg/Getty Images

It's a pretty sure bet we will never find Blake Lively and Dakota Fanning wearing the exact same little black dress.

When the Gossip Girl rocks an LBD, it's the most teeny version of the fashion staple she can find. At the New York premiere of Sherlock Holmes last December, the twentysomething wore a sexy number by Dolce & Gabbana. We're talking bustier, see-through lace and asymmetrical hemline with exposed thigh.

On the other hand, 16-year-old Dakota's style skews more cute and girlie. She chose a Marc by Marc Jacobs frock with a sweetheart neckline and a bow waist-tie detail when she attended the Cinema Audio Society Awards in February. Totally age appropriate!

So who paid more—over two grand—for her look? The sex kitten or the doe-eyed darling?

Find out who in mystyle's shopping game, Who Broke the Bank?

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...and sound off on more star style in our Fashion Police Gallery