Justin Timberlake Birthday: Former Mouseketeer Turns 31 By IBTimes Staff Reporter | Jan 31, 2012 09:27 AM EDT. Even on his own birthday, Justin Timberlake is all about his movies. Early Tuesday morning, the former Mouseketeer, who turns 31, took to Twitter to promote his latest film. "Did you know you can get the @intimemovie DVD/Blu-Ray tomorrow. Twitter feeds have also been flooding with birthday messages for the former NSYNC front man. "Happy birthday Justin Timberlake. Born Justin Randall Timberlake on Jan. 31, 1981 in Memphis, Tennessee, his aspirations to become a superstar arrived early, thanks to appearances on "Star Search" and "The New Mickey Mouse Club" (where he met Ryan Gosling, Britney Spears, Christina Aguilera and fellow 'N Sync member JC...