Sam McKnight He is the most renowned hairdresser in the world.  Written  He has worked for almost five decades in the fashion industry with Linda Evangelista and Cara Delevigne. He "invented" Princess Diana of Wales's famous short hairstyle and Kate Moss's fake unkempt mane. You may not be able to have Sam do your hair at home, but you can have  its products, designed so that in an easy way you get the hair you want. Who would have told you? You, sharing a hairdresser with Kate Moss and Princess Diana...