The bullet-riddled body of a man reported missing two days ago was found slumped in the back seat of his girlfriend’s car yesterday on a Queens street, police said.

A passer-by made the gruesome discovery at around 4:30 p.m. in a Pontiac Bonneville parked at the corner of 125th Street and 116th Avenue in South Ozone Park.

The 31-year-old victim was identified as Steven Pineda. He was shot twice in the head, police said.

Pineda, of Richmond Hill, was reported missing Wednesday, cops said.