Lindsay Lohan allegedly stormed out of an awards show when she saw her former assistant working for Hollywood beauty Jessica Biel.
The
Mean Girls star was drinking champagne with her mum Dina before running into her former PA at the glitzy GQ "Men Of The Year" Dinner.
An onlooker said: "She started screaming, 'If she stays, I'm out of 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!'
"It was really uncalled for. Jessica and everyone else ignored her."
Biel's assistant used to work for Lohan but angered her when she quit four months ago.
A pal of Biel said: "She didn't steal anyone's assistant her assistant stopped working for Lindsay a long time ago. And whatever drama happened, Jess was no part of it. She is not part of [Lohan's] crowd she is a professional."
After the incident, Lindsay tried flirting with DiCaprio without success, the
New York Post reports.
But when Jackass star Johnny Knoxville arrived later in the evening, Lohan lit up and the two began kissing until Lohan's ex, Harry Morton, appeared.
An onlooker said: "Harry had been called by Lindsay, and he arrived with a bunch of her friends, and then they all left together, including Johnny.
"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."
Leslie Sloane, a spokeswoman for Lindsay, 20, told the
New York Post:
"This does not sound like Lindsay."
It comes amid reports the actress has been going to Alcoholics Anonymous meetings in Los Angeles in a bid to curb her party lifestyle.