(people.com) - Is Lindsay Lohan back to her hard-partying ways? The actress - who completed a stint in Cirque Lodge rehab last September - is raising eyebrows again after she was spotted on Saturday drinking Grey Goose and Red Bull cocktails at a party deejayed by pal Samantha Ronson. Lohan, 21, smoked cigarettes, chatted with friends and hit the dance floor at Hawaiian Tropic Zone in New York as Ronson spun tunes until 4 a.m.Lohan's rep was not immediately available for comment. While Lohan and Ronson are frequent fixtures in hot Los Angeles clubs, the actress has opted for water over alcoholic beverages. During a recent visit to Foxtail, an L.A. hotspot, Lohan sipped water as Ronson spun in the deejay booth. In recent months, Lohan has maintained that she's working hard on her recovery effort by cutting out bad influences - "There are friends that have been hard to hang out with because they've gone done a different path," she told the U.K. edition of Glamour - and keeping trustworthy friends close. But she added: "That's not to say I'll never go to a club again because I'd be lying." Saturday wasn't the first time Lohan has been spotted drinking post-rehab. In January, she was videotaped drinking champagne directly from the bottle while visiting Capri, Italy. At the time, her lawyer Blair Berk told PEOPLE: "After being handed a champagne bottle while on a dance floor in Italy on New Year's Eve and drinking from it, the good news is that Lindsay stopped herself, called her sponsor, and got herself back on track. There is no magic cure here. The most unfortunate part of this is that Lindsay has to share her 'one day at a time' with the entire world."