Justin Timberlake to act as music supervisor on fiance Jessica Biel's next film 'The Devil and the Deep Blue Sea'

Justin Timberlake will be joining his fianc Jessica Biel for an upcoming movie, but the couple wont be co-stars.

Instead, the Sexy Back singer will be composing the music and acting as music supervisor on The Devil and the Deep Blue Sea, which stars Biel.

Jeffrey Dean Morgan and Chlo Grace Moretz will also appear in the film, MTV News reports.

Timberlake hasnt released music since his last solo effort Future Sex/Love Sounds in 2006. In recent years hes been focusing on his film career, appearing in such films as The Social Network and Friends with Benefits.

The Wrap reports that Bill Purple will direct The Devil and the Deep Blue Sea, while Robbie Pickering will write the script.

Michelle Purple will produce, along with Biel, in collaboration with Ross M. Dinerstein and Darby Angel.

Timberlakes supervising the films soundtrack will mark the first professional collaboration he will embark upon with his fianc, who has been in such films as Valentines Day and New Years Eve.

The two got engaged in December of last year. They are rumored to be walking down the aisle this summer. However, the infamously private couple hasnt confirmed anything.