The New Mexico teen who allegedly dumped her newborn in a hospital trash bin was pictured smiling at prom just three months after the harrowing incident — and a photographer who captured the evening said “you would never have known” about the recent tragedy.

Alexee Trevizo, 19, beamed in a tan mini dress and white sneakers alongside her longtime boyfriend, Devyn Fierro, at the late April event,photos obtained by The Daily Mail show.