Audrina Patridge Celebrates Birthday at Vegas Club Bash

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While Whitney Port was dining (and hanging) out, Audrina Patridge celebrated her 23rd birthday in Las Vegas Saturday night without her Hills BFFs.

The Hills star drank Grey Goose and Red Bull and goofed off with pals â€" including her mom! â€" while surely pocketing a fat paycheck at club LAX.

Audrina Looks Out

According to Us Weekly, Patridge danced to to Akon's "Smack That" while a female pal slapped her booty, and Madonna's "Four Minutes."

Audrina Patridge celebrates the 23rd anniversary of being born.

At 12:40 a.m., a white-frosted cake decorated with roses arrived. Audrina Patridge â€" who flew in from Hawaii, where she's filming her first movie, Into the Blue 2 â€" grabbed a rose and licked frosting off it. HOT!

At the party, Audrina Patridge flirted with a guy friend by giving him a peck on the lips, and later stole his fedora hat off his head.

So why didn't Lauren Conrad party with her pal in Vegas?

And where was supposed beau Justin-Bobby Brescia?

We may never know. But LC did say this last week:

"Obviously there is tension and other things going on. I mean, there are things in our relationship, but that's how every relationship is. You fight, you make up, you try your best to get along. Obviously we are going to have problems, but we are still friends and we love each other."

Besides, Lauren Conrad and their third roommate, Lauren Bosworth, threw Audrina Patridge a pool party at their Hollywood Hills home recently!

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