LOS ANGELES–When it comes to personal style, there’s no better embodiment of a brazen fashionista than Alexa Chung; and it’s no wonder that Madewell tapped her for a second collaborative collection (sales of her debut collection went through the roof) this fall. InStyle hosted a celebratory soiree in her honor last night, the eve before the collection hits stores, at the Chateau Marmont and packed the house with a stylish set including Amanda Seyfried, Diana Agron, Abbie Cornish, Jena Malone, Zelda Williams and more.

A pop-up shop displaying the entire line occupied guests for hours, while we made the rounds to see just what it is about Chung’s style that’s so decidedly addictive.

“She’s my favorite kind of sexy,” said Kate Bosworth, hot off her European run as the face of Vanessa Bruno. “I think Alexa is so chic and unique and playful. That tomboyish femininity…like she’s not trying too hard. You can tell she’s sharp, totally a smart girl.”

Clad in a prim ivory lace dress from the collection, Elle Fanning excitedly fawned over the fashion before embracing Alexa in a sweet hug to congratulate her. “Everything is so cute! I love Madewell and I love Alexa…having them together is like heaven!” enthused the young actress, who first met Chung at the Met Ball months ago. “She’s really, really fun. I love how she sort of wears baby doll dresses but still has the tomboy thing going on. It suits her so well.”

So what did the girl of the hour have to say about all of the fashion flattery?

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