I'm Convinced - Lindsey Lohan is an Alcoholic

Ah- yes. She is at it again. DESPITE attending "many" AA meetings this week, Lindsay Lohan drank and drank some more, and CLEARLY drank even more champagne and made a big scene at the GQ Men of the Year dinner - all under the supervision of her hard-partying mom/manager, Dina Lohan.

While partying is what Lohan does best, freaking out on people is what she seems to be doing better these days.

What caused her little tirade this time, when Jessica and her assistant walked in? Jessica Biel's assistant used to work for Lohan and earned the "Mean Girls" star's ire when she quit several months ago.

According to a witness, Lohan started screaming, "If she stays, I'm outta here! I can't look at that girl! I can't believe you would allow an assistant in here - she doesn't belong in here!"

According to a spy at Page Six, Jessica and everyone else ignored her snide comments and remarks.

But wait, the fun doesn't end there.

Lohan was basically put to the side as if she had some disease at the glittering affair by other celebs who are tired of her bratty antics and horrible work ethic. Overhearing her tirade about Biel's assistant, Will Ferrell turned to DiCaprio, Gore and Affleck and said, "Who cares about that freak anymore, anyway?" - setting off laughter. Later, Lohan, with a champagne glass in her hand, tried flirting with Leo, to no avail. AS IF anyway, right?

When "Jackass" star Johnny Knoxville arrived later in the evening, Lohan lit up and the two began nuzzling and necking - until Lohan's ex, Harry Morton, appeared.

"Harry had been called by Lindsay, and he arrived with a bunch of her friends, and then they all left together, including Johnny. It was weird," said a source. "Dina did a lousy job of reining in her daughter, and it looked like she just used Lindsay to get into the party in the first place."