Lindsay Lohan's efforts to clean up her act are off to a slow start.
The troubled 25-year-old actress was set to begin her first day of community service Thursday at the Los Angeles county morgue, but failed to show up on time for her orientation session and was turned away.
Lohan's spokesman, Steve Honig, told the Associated Press in a statement that his client was unsure of which entrance she should use to access the building and that her tardiness was the result of "confusion caused by the media waiting for her arrival."
The Mean Girls star -- who was turned away after arriving 40 minutes late for the 8 a.m. session -- was told to report again Friday, this time at 7 a.m.
"I'm sorry for the confusion that I may of caused to those at the Coroner's office. Won't happen again, now I know where to go!" Lohan apologetically tweeted Thursday, adding that she was eager to attend a therapy session after "all the stress and pressure from yesterday and today."
On Wednesday, Lohan's probation was revoked by L.A. judge Stephanie Sautner, who dismissed Lohan attorney Shawn Chapman Holley's argument the star delayed the completion of her community service requirements because she was out of town on jobs.
Lohan -- who was handcuffed upon exiting the courtroom -- is now required to complete 16 hours of service at the County Morgue before her next hearing on November 2. She was released on $100,000 bond.
In June, she was sentenced to complete 480 hours of community service, which required her to volunteer at a downtown Los Angeles women's shelter and clean the morgue.
She is expected to comply with the terms of her sentence by April 2012.