Lindsay Lohan's Assistant Told Police Actress Was Driving

Cops interviewed Lindsay's assistant Gavin shortly after the crash -- at the hospital where Lindsay was being treated -- and according to law enforcement sources, he told police he was riding shotgun when the accident occurred ... and Lindsay was driving.

As you know, Lindsay told cops she was a passenger in her Porsche, but authorities don't believe her and she will be charged with the crime of lying to cops.