Long Island’s hot-dog hooker is back to selling her buns, cops said yesterday.

Catherine Scalia, 47 — who got seven days in prison last year for selling sex out of her hot-dog truck — was busted again yesterday for prostitution, Nassau County cops said.

Sacalia was caught during a prostitution sting when she responded to a police officer’s call for a masseuse at an East Garden City motel.

She even drove her truck there, a source said.

Scalia, who’s not a registered masseuse, was charged with unauthorized practice and prostitution after offering to perform a sex act for cash.

She was taken to Nassau University Medical Center in East Meadow for psychiatric evaluation, a source said.

She is expected in court today.