The Irish-born hunk, who stars as Henry VIII in the new Showtime series "The Tudors," sashayed into The Plumm with his pony-tailed brunette love Reena Hammer under his arm the other night. They immediately retired to a couch and launched into a frenzied make-out session as a crowd of revelers became voyeurs. "It was really a scene. She straddled him, and they were at it for some time," our spy said. When the steamed-up duo finally called it quits, they left without even bothering to have a drink.