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  • RUMER WILLIS photo | Rumer Willis

Credit: Denise Truscello/WireImage

Updated: Saturday Aug 22, 2009 | 06:00 AM EDT

RUMER WILLIS

She's ready to party! The starlet is Vegas-ready in a sparkling Toni Maticevski minidress and patent platforms to celebrate her 21st birthday at TAO in Sin City.