This weekend marked the opening of Fendi's new Paris boutique... and who showed up to party? All the Hollywood stars, of course!

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Rihanna looked particularly ravishing - but then again, she's looked stunning nonstop the past couple days!

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Is that Mary-Kate...

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...smiling? What has happened to the world!

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Oh, Amy. Paris welcomed the Rehab singer, who performed for the A-list audience just after escaping some serious police scrutiny... think she sang well?