Alessandra Ambriosio & Friends at Grand Opening of Marquee Dayclub (PHOTOS)

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Alessandra Ambrosio hosted a slew of celeb friends over the weekend at the Grand Opening of Marquee Dayclub at the Cosmopolitan of Las Vegas. A pregnant Selma Blair, newly single Justin Bartha, plus Jamie-Lynn Sigler, Adrian Brody and Taye Diggs were all in attendance for the fun filled weekend.

The Victoria’s Secret model held court outside in a cabana Saturday for the dayclub opening, but the party hardly stopped there!The good looking gang proceeded to hit up Marquee club later Saturday night where sources tell us Alessandra (looking breathtaking in a gold cut out mini dress), Jamie, and Adrien had one big dance party! The group overlooked DJ Eric Morillo and all seemed in good spirits as they celebrated the night away.

Check out all the Sin City fun in our gallery!