LOS ANGELES (Reuters) - A new audio tape and other details from Lindsay Lohan's car chase and arrest this week reveal a woman pleading for help and witnesses saying the actress believed she was immune from punishment.

On the tape of a call to an emergency 911 line, which became public late on Thursday, the woman being chased by Lohan - who police said was the mother of her personal assistant - describes what happened.

"We were just about to park our car. We were coming home and out of nowhere this huge white GMC came up. The gentleman jumped out of the car, and oh my God, they are following us," the woman told a 911 operator.

She quickly turned hysterical and her speech is difficult to hear over screaming in the background. At one point, she can be heard yelling: "Oh my God, what is he doing?"

Lohan, 21, is a rising Hollywood star whose hard-partying ways have landed her in trouble in recent months.

She was arrested on Tuesday on suspicion of drunken driving and cocaine possession, among other charges, after a high-speed chase through the Santa Monica area near Los Angeles. It was the second time in a month that Lohan has faced drunken-driving charges.

Police arrested her in a parking lot with two passengers in the back of the car that police said she was driving.

The men who claimed to be inside with Lohan told celebrity Internet site TMZ.com that, during the chase, Lohan boasted she would not be arrested.

"I can't get into trouble. I'm a celebrity," one of the passengers claimed Lohan said.

He also said Lohan told police she was not driving and instead blamed "the black kid," referring to one of the other two people in the vehicle.

It was not clear whether they were friends of Lohan or if they were willing participants in the chase.