Lawyer Mark Geragos - working for his client Thaer Kamal - has reportedly contacted the Mean Girls actress' legal representative Shawn Holley claiming to have video evidence of Lindsay striking Thaer.
The footage also shows her getting out of the driver's side of the car, wobbling and getting into the passenger seat, where the passenger then takes over the wheel.
However, sources who were at the scene at the time have told TMZ.com it did not happen.
His lawyer has made it clear he has not yet gone to police and had an interview, and gave Lindsay's camp until Thursday to pay - it is not known if she has.
Thaer also reportedly told people at the scene he was not injured but changed his mind when he heard the troubled star was the one behind the wheel.
Lindsay hit out at the accusation she had "scraped" someone with her car last week on Twitter.
She said: "Scrape? This is all a complete lie. I've been at community service. Last night, I attempted to wish a friend happy birthday, which I didn't even get to do because I was freaked out by all of the paparazzi. These false accusations are absurd."
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