The incident happened Friday morning on McDonald Avenue in Bensonhurst, Brooklyn.
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Authorities say the man approached the victim from behind and slapped her in the buttocks before fleeing on foot in an unknown direction.
The individual is described as a male, approximately 50 years old and around 5-foot-10 with a salt and pepper beard.
Cops say the suspect was last seen wearing a black North Face hooded jacket, a blue hooded sweatshirt, blue jeans and black sneakers.
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Police say the woman was not hurt.
Anyone with information in regard to this incident is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).
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