Justin Timberlake and Ashton Kutcher war over who started the trucker cap trend!

Justin Timberlake has sparked a style war with Ashton Kutcher over the popularity of fashion accessory the trucker hat, after both stars insisting they innovated the trend.The SexyBack singer believes that he and his William Rast fashion line partner and childhood friend, Trace Ayala, were responsible for making the hats cool.He explains: "It's funny. I keep hearing Ashton Kutcher say how he was responsible for trucker caps. I've heard him make that statement before."Trace and I were wearing them when we were seventeen. We just kind of didn't care. We kind of still don't."