A Harlem woman was sexually assaulted in the lobby of her apartment building early Friday, police said.

A man approached the 19-year-old as she entered the building near West 145th and St. Nicholas Ave, exposing himself and pushing her against the wall.

The sicko then pushed the her against the wall, rubbed up against her, forced her pants down and performed a sex act before fleeing, police said. The victim was taken to Harlem Hospital.

The creep is described as a Hispanic man, mid- to late-30s, around 5-foot-8 tall and 140 pounds, with black hair and brown eyes. He was last seen wearing a T-shirt, jeans and a baseball cap and carrying a backpack and shopping bags.