A mystery woman has been publicly shamed on New York's Upper East Side for allegedly not picking up her dog's poop from the sidewalk.

On Tuesday afternoon, rogue posters started appearing in the ritzy Big Apple neighborhood, blasting the unnamed woman who walked with a pup by her side.

The poster read: 'Do you know her? She let's (sic) her dog poop on the street and refuses to pick it up,' along with the black and white image.

She appeared wearing a Chanel bag, with a baseball hat and a chic sweater wrapped around her shoulders while walking her dog - while seemingly shouting in the direction of the photographer.

Locals, who have noted an uptick in animal feces plaguing their streets in recent months, have taken to public shaming to identify the woman and bring her to justice.