IS “Harry Potter” star Emma Watson under the spell of a new man? She was spotted with handsome Spanish rock star Rafael Cebrian at Saturday’s Rangers game at the Garden. A spy said, “They were sitting with Yves Saint Laurent creative director Stefano Pilati. But Emma and Rafael looked like they were on a date. They were sitting very close together.” Watson, now at Brown, had been dating financier Jay Barrymore, who was reportedly planning a move from Britain last summer, fearing she’d meet a new man at the school. Cebrian, drummer in the band Monomes, is a fellow student at Brown. Watson’s LA agent refused to comment and her UK publicist was unavailable.