Sienna Miller has long claimed that her wild party girl days are behind her — but a picture is worth a thousand words!

Looking less than sober, the 27-year-old British starlet was spotted partying at a New York night club with friends last night (October 6). Miss Miller was among the last to leave after receiving a helping hand out of the cocktail lounge.

But before you judge, this may merely be a case of method acting. Sienna is currently starring on Broadway in Patrick Marber’s steamy play After Miss Julie. The production deals with themes of morality, sex, class and debauchery.