Who is Alex Pettyfer? All of the following: a 19-year-old British actor whose biggest credit is the British flop Stormbreaker, the ex-boyfriend of actress Emma Roberts, the lead in the upcoming "Mary-Kate Olsen is a witch" fantasy Beastly, the muse to photographer Greg Gorman (NSFW!), and this week, the man cast in the coveted title role of the DJ Caruso-directed sci-fi epic I Am Number Four. And now you know! [Variety]