I'm not sure who's more famous - Jennifer Aniston or her hair. The actress's mane has made headlines since the Friends days. And although she created her own hair brand, she relies on an award-winning shampoo formula to keep her hair shiny and frizz-free. Aniston's longtime hairstylist, Chris McMillan, shared the secret behind the actress's iconic sleek coif with Vogue. Before any styling products touch her hair, he says the most important part of her routine includes double cleansing with the Living Proof No Frizz Shampoo.