At about 3.55pm a man was driving in High Street, Sandhurst, near the Toyota garage in a dark blue Ford Fiesta.
He slowed down the car, before shouting towards the young girl. He then raised himself up while still in the car, unzipped his trousers and exposed himself to her.
He was then believed to have driven off at speed towards Sandhurst.
The male is described as white, clean shaven, about 20 years old, medium build with blonde, combed back hair.
Police would like to speak to anyone who may have seen anything suspicious in the area at the time. Witnesses should call 101 or Crimestoppers anonymously on 0800 555111.
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