Happy Birthday, Lindsay Lohan!

Lindsay Lohan received quite a surprising birthday gift Thursday night.

While celebrating her 24th birthday, Lohan was spotted out at the L.A. nightclub Voyeur. While minding her own business, a cocktail waitress reportedly punched the Mean Girls star in the face, the New York Post has released.

Lohan, who for once did not cause her own drama, wrote on her Twitter page shortly after the incident, saying that "a waitress just hit me -- punched me for no reason.”

Only one reason has surfaced so far as to why the waitress would attack Lohan, and that is jealousy.

According to a source, "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!"

As of now, it has been reported that the managers of Voyeur will soon be firing the waitress.