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Guess Blake Lively isn't the only Gossip Girl with a cute puppy!

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Porcelain-faced Leighton Meester, who plays Serena's nemesis Blair Waldorf on GG, was spotted looking very Rachel Bilson-like in between takes on the set.

Red is such a hot color on her! Especially in that schoolgirl outfit.

Hey, it's what she looks good in!