LiLo Leaves Rehab, Parties in Vegas

7/15/2007 8:43 PM PDT

LiLo Leaves Rehab, Parties in Vegas

After more than six weeks in rehab, Lindsay Lohan finally left Promises rehab facility -- and headed straight for Sin City! TMZ has learned that LiLo headed to Vegas nightclub Pure to attend the surprise birthday of her roommate/assistant, Jenny.

A smiling Lohan lived it up with a posse of ten or so pals, and rocked the mic with Pure turntablist, DJ Hollywood. Nary a beer bottle nor wine glass was in sight!

Lohan completed a 45-day stay at the swank drug and alcohol rehab center Promises, and will now begin an intensive outpatient program with the facility. No word on how partying it up at Pure fits into into her post-rehab plan.

To keep her on the straight and narrow, Lohan's opted to wear an alcohol monitoring ankle bracelet. "She chose to do so that there's no question of her sobriety when she goes to places where alcohol is served," said her publicist Leslie Sloane Zelnik, who added that when she spoke to Lohan in Vegas, she'd opted to eat chocolate chip pancakes over going gambling.