Lindsay Lohan: Turned Away at Morgue after Showing Up Late

Lindsay Lohan was turned away from the L.A. County Morgue, after showing up late ... Incredible.

We broke the story ... Lindsay was supposed to show up by 8 AM, but at 7:40 her assistant called to say she'd be there in 10 minutes. Tick, tick, tick.

We're told Lindsay didn't show up until 8:40. Her publicist claims she was late "due to a combination of not knowing the entrance to go through and confusion caused by the media waiting for her arrival."

Lindsay was met at the door by Coroner's officials who turned her away.

We're told the Coroner's office then contacted the Probation Dept.'s Volunteer Center -- which supervises Lindsay's probation -- and notified them that she was late ... AGAIN. That info will be forwarded on to Judge Stephanie Sautner.

Lindsay just tweeted, "With all of the stress and pressure from yesterday and today, I've never been so happy to go to therapy!!! Also, I'm sorry for the confusion that I may of (sic) caused to those at the Coroner's office. Won't happen again, now I know where to go!"

It's not a violation for her not to show today ... the judge only required that Lindsay put in 16 hours at the morgue a week by Nov 2. But it's awful for Lindsay and her lawyer, who will try to convince the judge that she's not thumbing her nose at authority.