Amanda Bynes has reportedly been involved in a third hit-and-run incident.

The 'Hairspray' actress is at the centre of a police investigation after a woman reported her for allegedly bumping into the rear end of her vehicle then driving off after refusing to exchange insurance information in the San Fernando Valley yesterday (05.08.12).

The woman, known only as Kisa, told TMZ that Amanda ''looked like a hot mess'' and claims she didn't immediately recognise the former child star when her Toyota Corolla was struck by the actress' black BMV on Ventura Boulevard.

Kisa added that Amanda ''seemed nervous'' when she suggested they swap information and says the 26-year-old star attempted to play down the ''significant'' damage before returning to her vehicle and driving off.

Kisa then called police, who filed a hit-and-run report.

The alleged incident is the latest in a string of vehicular problems for the troubled actress, which has included two other allegations of leaving the scene of an accident, and one of driving under The Influence (DUI).

Amanda was arrested on April 6 on suspicion of DUI after allegedly running into the back of a police car in West Hollywood.

She pled not guilty in court and reached out to President Obama on twitter for help, claiming she is tee-total.

The 26-year-old star wrote: ''Hey @BarackObama... I don't drink. Please fire the cop who arrested me.''

The actress is also accused of two hit-and-run incidents in the Hollywood area on May 5 and May 27.