Lindsay Lohan's 24th birthday celebrations in Los Angeles ended in agony in the early hours of Friday after the actress was allegedly punched by a waitress.
The Mean Girls star took a group of friends, including Paris Hilton's ex-boyfriend Doug Reinhardt, to a nightclub in the city on Thursday to mark her birthday the following day.
But the outing allegedly ended in a brawl, with Lohan taking to her Twitter.com early on Friday morning to claim she had been attacked.
She wrote, "A waitress just hit me - punched me for no reason."
A witness confirmed the alleged incident to Us Weekly, and claimed the unnamed woman approached Lohan after she spotted her with Reinhardt.
The source says, "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! Doug didn't want any part of it and went to the other side of the booth. Lohan ran out."
More Lindsay Lohan Pictures