He’s probably not smiling now.

An alleged pervert who was photographed grinning and waving after exposing himself aboard the A train in Manhattan is in custody, authorities said.

George Matias, 50, was arrested Thursday afternoon and charged with public lewdness for the display, police said.

The Washington Heights resident exposed himself to his fellow riders while aboard a southbound A train traveling between 175th Street and 34th Street around 9:30 a.m. Feb. 23, cops allege.

When one disgusted straphanger started snapping photos of the suspect, the shameless creep flashed a smile and waved to the camera.