A 44-year-old woman was assaulted in broad daylight in Church Street, Wadenhoe.
A man approached the woman and assaulted her sometime between midday and 12.15pm on Friday, February 13.
The offender was a white man, 6ft and of slim build.
He had a pale complexion and wore a black hooded top, dark jeans and a black beanie hat.
He drove off in a small silver car.
Police would like to speak to anyone who was in Wadenhoe on Friday afternoon and witnessed the incident or seen a silver car in the village.
Witnesses or anyone with information is asked to contact Northamptonshire Police on 101 or Crimestoppers anonymously on 0800 555111.