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Timberlake's representative has blasted rumors he's cozying up to movie co-star Mila Kunis behind his girlfriend Jessica Biel's back.

The singer-turned-actor has been shooting "Friends with Benefits (2012)" with Kunis in Los Angelesand the pair has been snapped laughing and joking around on several occasions after the cameras have stopped rolling.

Their close relationship has sparked speculation there's more to their friendship than it seems - but Timberlake's spokesperson has shot down the claims, telling Us Weekly magazine there is "absolutely no truth" to the reports.

In "Friends with Benefits", Justin Timberlake and Mila Kunis play a couple who agrees to sleep together with no strings attached. Things get complicated when the guy falls for the girl, who's dating someone else. This Will Gluck-directed comedy has not got an exact release date.