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Rachel Bilson's Red Carpet Style Evolution

Ever since her days as Summer Roberts on The O.C., April cover star Rachel Bilson has always had a sharp sense of style. Whether she's mixing florals with brights, experimenting with metallics or slipping into one of Karl Lagerfeld's showstopping creations, Bilson rarely puts a (size five!) foot wrong. Check out our roundup of some of her best red carpet looks of all time. Which is your favorite?

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Rachel flawlessly pairs bright red pants with a sweet floral shirt, both by Erdem.

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Cozying up to Karl Lagerfeld and wearing Chanel Couture, Rachel's pretty much living our dream. Sigh.

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In another Chanel creation, sans Lagerfeld this time.

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Celebrating the one-year anniversary of Phillip Lim's L.A. boutique wearing an awesome metallic short suit by the designer.

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We adored this retro-inspired floral Louis Vuitton dress Rachel wore to the 2012 Met Costume Institute Gala.

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With her green strapless Bally and poker-straight hair at the 2009 Met Gala, Rachel was definitely channeling her O.C. alter ego, Summer.

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In a lovely asymmetrical Lanvin with Alber Elbaz's signature exposed zipper, Bilson proves that some styles just never date.

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In lace-overlaid Wunderkind at the 2006 Vanity Fair Oscars party. Ah, trapeze dresses were such a comfortable trend....

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In Chanel yet again, this time at the grand reopening of the French label's SoHo boutique in NYC. This look was originally shown with opaque white tights and knee-high white leather boots on the runway, but Rachel's completely made it her own with her simpler styling choices.

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Dipping into metallics once more, this time in strapless Lela Rose at the 2005 Emmys.

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Stunning and sexy in Roberto Cavalli at the designer's 40th anniversary bash.

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Few celebs pull off figure-hugging bandage dresses as well as Rachel, here in Hervé Léger at the 2008 Whitney Art Party.

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Alongside Rose Byrne at a party to celebrate Derek Lam's capsule collection for eBay, in a floor-sweeping floral dress from Lam's collab.

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Perhaps our favorite Chanel look that Rachel's worn to date (and clearly, that includes dozens), this feathered mint frock is the very definition of a showstopper. Well played, Bilson.

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