Jill Stonerock, Rachel Bilson

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Rachel Bilson hosted a girls-only getaway for her BFF Jill Stonerock's bachelorette party as she kissed single life sayonara.

Friday night, Rach and her party posse had dinner at Fix before hitting the Bank Nightclub at the Bellagio.

At the hot spot, they fed each other cake as they drank and danced until the early morning.

On Saturday, the girls hit the tops-optional Bare Pool Lounge, where Britney Spears hung last weekend.

But even after rounds of margaritas and strawberry mojitos, the O.C. starlet opted to keep her bikini top on.

Bet her boyfriend, Hayden Christensen, is happy to hear that!

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