"I saw Julianne Moore walk past me a couple of weeks ago, and we smiled at each other. I don't think she knew it was me, I just think she thought it was somebody smiling at her. You do see a lot of people, and I'm as guilty of it as anybody. I get so excited when I spot someone, like, 'Oh, there's Kiefer Sutherland!'" Harry Potter star Daniel Radcliffe loves to go celeb-spotting around the streets of New York.