The former sportsman and style icon is helping to develop Savile Row brand Kent and Curwen as part of his partnership with Global Brands Group, and now David has allegedly turned to Jennifer Aniston's new husband to give the line an edgy feel.

"Justin has provisionally agreed to design leather motorbike jackets, vintage caps and other elements of biker style, which is his trademark look," a source tells Britain's Grazia magazine.

The two stars have grown close thanks to mutual pal Liv Tyler, whose fiance is David's best friend, sports agent Dave Gardner.

Justin's low-key style has also reportedly won him a fan in Courteney Cox's fiance, Snow Patrol rocker Johnny MCDaid.

"Before meeting Courteney, Johnny's look was always pretty casual," an insider previously told Grazia. "Courteney and Jennifer are pretty much inseparable and as they started spending more and more time together as a foursome, Johnny began taking tips from Justin's wardrobe, and black is now his staple.

"Justin is flattered. He works hard on his look so he's more than happy to give Johnny fashion advice. They've all joked that Johnny is turning into him."