Cops are looking for a dopey Bronx thief who stole a woman’s cell phone and then was dumb enough to accidentally post a photo of himself smoking marijuana on her Facebook page.

Police say the perp robbed the 27-year-old victim’s phone on March 2 near East Tremont Avenue and the Grand Concourse at around 3:00 a.m. before running off.

Not long after, the victim noticed a photo of the man who robbed her taking a huge hit of weed on her Facebook wall and alerted the authorities. Cops said the victim’s phone was linked with her Facebook account to automatically post photos.

Police said they are working to identify the perp who was last seen wearing a blue hat, blue sneakers and an orange jacket.