Karlie Kloss and More Fashion Week Models Tell All . . .

We caught Cindy backstage at Jill Stuart fresh from the makeup chair (and in the middle of taking a selfie). She broke down her best hair tips. "I don't want to sound like a diva, but it's really important to wash your hair with [bottled] mineral water," she said. "The water from the shower is too hard and not pure." Between shows, the French fashionista treats her natural curls to a Kérastase hair mask ($65) or sleeps in her favorite L'Oréal oil ($13).

Photo: Jessica Cruel