What a piece of work.

Cops are hunting for a package thief who was caught on camera on Long Island stealing a 6-year-old boy’s birthday gift, police said Monday.

The thief struck around 2:40 p.m. Oct. 21, stealing the boy’s Lego set from the Mastic Beach home, according to cops.

Suffolk County Police released photos of the woman, wearing a yellow sweatsuit, grabbing the package from the front porch and getting into a white SUV.