Lindsay Lohan, who just turned 24 today, got more than she bargained for while enjoying a sober evening out -- she was attacked by a waitress at L.A. club Voyeur early Friday morning, according to Us magazine.

Lohan broke the shocking news via Twitter: "A waitress just hit me - punched me for no reason."

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Here's how Us mag says it went down: "The waitress has a history with Doug Reinhardt, and Lohan was hanging out with him. She was jealous, and out of nowhere, the waitress punched her in the face!" the insider tells Us. "Doug didn't want any part of it and went to the other side of the booth. Lohan ran out."

Poor LiLo ... even with a SCRAM bracelet, she still can't stay out of trouble. Let's hope the rest of her weekend is quiet.

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