Supposedly the waitress was jealous because Lindsay was hanging out with…douchey Doug Reinhardt?!
"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."
La Loca then went to a party at the nearby Rockstar House, but the punching waitress was there, too! The source adds:
"Lohan showed up and cried because the waitress was there as well. Some birthday."
We think she has bigger things to cry about!
[Image via XposurePhotos.com.]