When he's not getting all bent out of shape, acting all arrogant and threatening innocent, hard-working journalists, singer Justin Timberlake is busy stepping out with a new undertaking -- launching his own clothing line, William Rast. Here, JT is seen with BFF Trace Ayala (left) at L.A.'s Social Hollywood on Tuesday.

Without a doubt, Justin Timberlake's runway show was one of the hottest tickets at Los Angeles Fashion Week, which kicked off on Sunday.

Among the many celebrity guests were Ellen DeGeneres, Paris Hilton, Adam Levine (he who once banged Jessica Simpson -- hats off to you, sir) and, naturally, Justin's girlfriend Cameron Diaz. In the above pic, Cameron is certainly showcasing her (sexy) back. God, that was lame. We're real sorry for that one.