The unidentified young lady accompanied Radcliffe on a walk in Manhattan, where he has been starring in the Tony-nominated Broadway revival of "How to Succeed in Business Without Really Trying."
Radcliffe, 22, spoke briefly about his relationship on CNN's "Larry King Special: Harry Potter -- The Final Chapter" on July 15, telling interviewer King that "I've got a girlfriend at the moment who I am very much in love with. So you know, we'll see where that goes." He added that he "absolutely" wanted a family someday, and joked, "I need to get someone who's willing first, yes."
In 2007, at 17, he had been linked to actress Laura O'Toole, then 22, an understudy in the London revival of the play "Equus," in which he starred. Last summer the British press reported he was dating Olive Uniacke, then 19, the stepdaughter of "Potter"-film producer David Heyman.