Demi and Bruce's girl is all grown up! Rumer Willis celebrated her 21st birthday at TAO at the Venetian in Las Vegas over the weekend.

The "House Bunny" star's famous parents were there to celebrate, along with step-dad Ashton Kutcher, step-mom Emma Heming, boyfriend Micah Alberti and "Hills" pal Audrina Patridge.

rumer willis celebrates her 21st birthday

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