This alleged mugger’s vanity did him in.

A man who swiped a Samsung Galaxy smartphone from a 16-year-old boy decided to snap a self-portrait (pictured) using the stolen gizmo, police said.

Albert Wilson, 19, and five accomplices surrounded the victim at Southern Boulevard and East 175th Street at around 9:50 p.m. Saturday, ordering him to hand over the phone, cops added.

But the boy had the device programmed to automatically send him e-mails of every photo taken — netting him a picture of the accused thief, cops said.

The image allowed police to identify and nab Wilson.

He was charged with robbery, possession of stolen property and possession of a controlled substance.