By John Young
April 30, 2010 at 08:48 PM EDT

Lindsay Lohan could be heading to jail for allegedly violating her DUI probation, People reports. According to an initial report by, the 23-year-old actress hasn’t followed her probation judge’s order to attend an alcohol education class once a week. Lohan’s next progress hearing is scheduled for May 20, during which it’ll be revealed whether or not Lohan has in fact violated the terms of her four-year probation, which she received following her second DUI conviction in 2007. “Though there have been occasional weeks when Lindsay has missed her alcohol treatment class, she has always managed to make up the class the following week by attending two classes,” Lohan’s attorney, Shawn Chapman Holley, told People. “We have received no negative written report from the program.”