The man's picture was also captured by a surveillance camera.
Police say the man was at Triumph Brewery late Sunday night when, a woman claims, he followed her into the bathroom and peeked at her through a crack in the stall door.
The man was gone by the time police arrived.
He is described as Hispanic, 25-30 years old, 5'8" tall with a thin build.
He was wearing a gray hooded vest and a baseball cap with an Atlanta Falcons logo.
Anyone who recognizes the suspect is asked to contact Princeton police at 609-921-2100.
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