COSTUMES IN STYLE

Trick or treat — Nina Agdal is getting a jump on Halloween. The 25-year-old supermodel (below) will host a Halloween bash at the Wall Street boite Mailroom on Wednesday. The party starts at 9:30 p.m. and costumes are “encouraged” for those who want to skip past the velvet rope. Agdal, who’s rumored to be dating supermodel Christie Brinkley’s son Jack Brinkley-Cook, was at Madison Square Garden on Monday to watch the Rangers lose to the San Jose Sharks.