Blake Lively has popped up everywhere lately -- looking completely different every time we see her!

Between filming as posh NY socialite Serena van der Woodsen on the set of "Gossip Girl" (left), appearing brunette in EW as Carol Ferris in "Green Lantern" (center) and showing a trashier side as a Bostonian in the trailer for "The Town" (right), there's no escaping her.

The question is ...

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