Justin Timberlake is apparently serious about this acting thing. The aspiring thesp — who makes his big-screen debut in the forthcoming indie Edison — will co-star alongside Emile Hirsch (The Girl Next Door) in the Nick Cassavetes-directed drama Alpha Dog, per The Hollywood Reporter. The story centers around a drug dealer (Hirsch) who becomes one of the youngest men ever on the FBI's most-wanted list. Timberlake will play the best friend.