The last Sin City party "The Hills" star Audrina Patridge hosted was last month for a girls' day out in the sun. But over the weekend, 'Drina celebrated her 25th birthday at Liquid Pool Lounge in Las Vegas -- this time with boyfriend Ryan Cabrera in tow. She rocked a skimpy brown fringe bikini with Christian Louboutin wedge heels, which she eventually kicked off to jump into the pool for a little water fight/canoodling with her man.
+ What do you think of 'Drina's earthy bikini? Are you digging the fringe? Let us know!