Audrina Patridge's Vegas Birthday Bash

Back on the mainland, Audrina Patridge spent Saturday night (May 17) celebrating with a belated birthday bash in Las Vegas (she actually turned 23 on May 9th).

Held at LAX nightclub inside the Luxor Hotel, the Hills hottie spent the evening mingling and dancing with family and friends - being presented with a cake in honor of the special occasion.

As previously reported by Gossip Girls, Audrina spent the past week in Hawaii working on "Into the Blue 2: The Reef", which tells the story of "Sebastion (Chris Carmack, of The O.C.) and Dani (Laura Vandervoort, Smallville), a married couple hired as professional divers to search for Columbus' hidden treasure. To their horror, they learn that their wealthy employers have a much more terrifying agenda."

In the straight-to-DVD flick, "Patridge will play a no-nonsense beach beauty whose boyfriend caters to her every demand."

Gossip Girls

Enjoy the pictures of Audrina Patridge celebrating her 23rd birthday (May 17).