Making her way to Sin City, Lauren 'Lo' Bosworth was out partying it up at the Planet Hollywood Resort & Casino in Las Vegas, Nevada on Monday (May 24).
The "Hills" hottie made the appearance for Cosmopolitan Magazine's third annual Bikini Bash - during which she helped kick off the 2010 Nivea Good-bye Cellulite Challenge.
Aside from her Vegas doings, Miss Bosworth recently announced that she's writing a dating advice book called The Lo-Down.
Described as "a guide for dating that will detail her own trials and tribulations," the offering will hit stores in January, 2011.
