Most of Audrina Turns 23 in Las Vegas

5/18/2008 3:10 PM PDT BY TMZ STAFF
The only two reasons to watch "The Hills" celebrated her 23rd birthday at LAX Nightclub in Las Vegas night.
Audrina Patridge: Click to view the pics!
Audrina Patridge's birthday was actually on the 9th -- but who cares, really? Btw, no sign of Lauren at the shindig -- fake show frenemies are the worst kind!