A naked car passenger exposed himself to a woman while she walked through Burton Latimer.
Police are appealing for witnesses to the indecent exposure in Finedon Road which took place at about 7.15pm on Monday, August 19.
A police spokesman said: “A woman was walking along Finedon Road, close to the junction with Whitney Road, when somebody in a small silver car sounded the horn to get her attention.
“When she looked in the car the passenger was naked and raised himself out of the seat to expose himself to her.”
Both the offender and driver are white, in their early twenties with short brown hair.
The offender had coloured tattoos on his right upper arm.
Any witnesses to the incident are asked to call Northamptonshire Police on 101 or information can be given anonymously to Crimestoppers on 0800 555111.