Rumer Willis has a lot to be happy about.

The 24-year-old daughter of Demi Moore and Bruce Willis hit up Marquee Dayclub in Las Vegas over the weekend to celebrate her hot boyfriend Jayson Blair's b-day.

While Blair, who stars on NBC's "The New Normal," didn't go shirtless at his party, Rumer flaunted her bikini body ... and she looked great!

She was seen sporting a skimpy two-piece as she posed for photos with her man.

Check out more photos of her impressive physique in the gallery above!

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