Four Long Island teens were shot by a drive-by gunman outside a “large house party” Saturday night, police said.

The shooting happened just before midnight in Freeport after a bash on Babylon Turnpike spilled into the residential neighborhood, according to Nassau County cops.

A shooter in a car traveling south on the turnpike fired multiple shots into the crowd on Independence Avenue, injuring two 16-year-old boys, a 16-year-old girl and a 14-year-old boy, police said.

The injured teens were being treated at area hospitals while cops looked for the shooter.