"I was always the girl who would turn up to fashion shows in trainers, flares, a shearling jacket and braids in my hair. I look back and I was really cute, but all the other girls were slick, groomed and elegant, while I’d be backstage drinking a can of beer... That kind of thing doesn’t go down well in America." British supermodel Rosie Huntington-Whiteley fears she offended her American counterparts.