15 Stars Who Don't Wash Their Hair Every Day, Including 2 Celebs Who 'Never' Wash Their Hair, One That Waits 2 Months Between Shampoos & More

Jessica Simpson

How often does she wash her hair? Once a week.

Jessica Simpson said during a cover shoot with Lucky Magazine, “I think that the best thing you can do for your hair is only wash it once a week. If you clean your hair too much, it just strips down the natural oils.”

Amanda Seyfried

How often does she wash her hair? Once a week.

Amanda Seyfried revealed that she washes her hair once a week in a 2014 Vogue interview, in which she also mentioned her reliance on dry shampoo.