Los Angeles: Singer-actor Justin Timberlake and "Vinyl" star Juno Temple have joined the cast of veteran filmmaker Woody Allen's next film, which is yet untited. Kate Winslet already boarded the project last month, and Jim Belushi recently signed on to star in it. The project will mark the first collaboration between Timberlake, who is best known for his roles in "The Social Network" and "Inside Llewyn Davis", and Allen, reports hollywoodreporter.com. The new film is being produced by Letty Aronson, Erika Aronson and Edward Walson. Other details about the project are being kept a secret.