School Magazine, Interviews with Famous people!?

Hey, For My school Magazine, We want to contact somebody Famous for an Interview. We are looking at Local Famous people, like TV presenters to members of U2,By the way I live In Dublin, Ireland, but we dont mind the Idea of any famous people within the UK and Ireland. Anyway, How do I go about getting me in contact with some famous people, and any suggestions?
Thanks for your Help!