The Mirrors singer revealed he's teamed-up with Marcus Mumford on a tune for his latest movie, Coen brothers' Inside Llewyn Davis, which also stars Mumford's wife, actress Carey Mulligan.
Revealing the news during an interview with Capital FM, Timberlake stated: "OK I can tell you this. There's a Coen brothers film coming out soon that I was lucky enough to work with Oscar Isaac and Carey Mulligan.
"And coincidentally I did work with Marcus Mumford on the soundtrack, so I became very good friends with them."
The formerNSYNC star continued: "Marcus and myself, we all kind of worked on the music together and I don't know any other world where we would have the opportunity to collaborate like that but it was so much fun.
"So not only will that be a great movie, but the music to it will be fantastic."