A Long Island woman used a Walgreens photo machine to snap several pictures of herself and ran off with the prints without paying — but she forgot about the big digital picture of herself still on the screen.

Suffolk County cops used the pursed-lips shot on a wanted poster of the brunette.

They said the woman took a series of selfies at a photo machine in the drugstore on Middle Country Road in Selden on 3:20 p.m. Jan. 14, then ran off with the shots without paying.

Cops released her photo Wednesday, and said she’ll face petit-larceny charges when she’s apprehended.