Nicky Hilton, Allison Melnick and Paris Hilton help celebrate Allison's birthday with a custom cake at Marquee Nightclub.

Paris and Nicky Hilton were spotted in a cabana at Marquee Dayclub on Saturday before heading to Marquee Nightclub at the Cosmopolitan later in the night to celebrate their friend Allison Melnick’s 40th birthday.

Nightlife queen Melnick, the Hiltons, Jennifer Rovero and friends took over a table near the dance floor in the main room and were joined by actor Lukas Haas and comedian Pauly Shore. The birthday girl was surprised with a pink cake adorned by pastel bubbles and a pink bow.

Confetti rained on Marquee’s crowd as Paris stood on top of a table, glow stick in hand, dancing and singing along to the sounds of Kaskade. She was the life of the party and took in all the action atop her table while her sister Nicky laid low in the booth.

Also spotted in the club was Joakim Noah. The Chicago Bulls center was joined by friends from Chicago.

On Friday night, Luol Deng of the Chicago Bulls was spotted soaking in the sun at Marquee Dayclub. He was joined by friends who sipped mojitos and frozen lemonade while dining on pizza, crispy shrimp and seafood tacos. He returned at night to check out the Boombox room in the nightclub with friends.

Friday night Paris Hilton and a few friends stopped by Marquee Nightclub to check out the sounds of Axwell from a VIP table in the main room. Actor Lukas Haas later joined the group.

Click on the photos below to enlarge.

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