Bikini Babe Audrina Patridge's Sin City Birthday Bash

Spending the weekend celebrating in Las Vegas, Audrina Patridge flaunted her bikini body at Wet Republic Ultra Pool at the MGM Grand on Saturday afternoon (May 12).

Having turned 27-years-old on Wednesday (May 9), the former "Hills" hottie was joined by boyfriend Corey Bohan and a group of close pals while soaking up the sun, downing drinks and cooling off in the water.

Prior to setting off for the Sin City festivities, Audrina tweeted, "Vegas bound! Who's coming to party with me @WetRepublic tomorrow?!"

As for her killer bikini body, Miss Patridge attributes her 2010 stint on ABC's "Dancing with the Stars" to getting her in the best shape of her life.

Of this, the brunette beauty previously told Us magazine, "I would say I'm in the best shape of my life. Dancing is so different than going to the gym. I'm going to be so sad when it's over!"

"I feel more toned and more defined for sure," Audrina added. "I have maintained my weight, but I'm really, really defining my muscles and toning up."