Clearly charmed by Guy on their boys' night out this week, Justin Timberlake has reportedly promised the director that he will star in his next film.
The pair, who spent an evening at Guy's Mayfair pub, The Punchbowl, on Monday, apparently discussed the new musical project and came to an agreement.
Madonna's ex-husband, who is currently working on a remake of 1955 musical Guys And Dolls - which starred Marlon Brando - is keen to get the popular singer on board after being impressed by his acting in Alpha Dog, in which he played a gang member (pictured).
"Guy rates Justin as an actor. He thought he was impressive in Alpha Dog. He likes his personality," a source close to the director says.