Punchy Biebs is called gal’s hero

JUSTIN BIEBER went to a party Saturday night — and ended up a hero.

The “Sorry” singer, 24, reportedly punched a man in the face at a bash celebrating the Coachella music festival in Indio, Calif., after Bieber saw him grab a woman by the throat, according to TMZ.

The man, who appeared to be on drugs, “went ballistic” after spotting the woman believed to be an ex-girlfriend, the site said.

Bieber socked him in the face in an attempt to free the woman.

TMZ reported the man was kicked out of the party and arrested after he created a disturbance outside.

Bieber’s rep did not respond to a request for comment.