An update for the denim-obsessed (hello, like, everyone): here are three cool ways to wear it now. Olivia Palermo has updated her skinnies with strategically placed rips and a statement sweatshirt. Keira Knightley, meanwhile, is firmly in the cool-girl camp, with her loose dungaree turn-ups. Selena Gomez, ever the California style queen, kills it in an indigo onesie (NB this would totally work with tights and boots in chillier places).