Justin Timberlake joins Friends With Benefits. Justin Timberlake has joined the cast of the upcoming film Friends With Benefits. The popstar will play one of the three leads of the film about a headhunter who begins casually sleeping with a magazine editor. The script, which has the the same name as recently announced projects by Ivan Reitman and an orphaned ABC pilot, was written by Keith Merryman and David Newman. Timberlake has recently landed roles in the film The Social Network and Bad Teacher.