This Is the Best Beauty Advice You'll Ever Get — and It Comes From Jordana Brewster

"I don't wash it a lot. I only wash it like two or three times a week, which I think really keeps it soft and moisturized. When I do wash it, I put in a leave-in conditioner, like Moroccanoil Hydrating Styling Cream ($34), then I put it in a bun and let it dry. I don't mind dirty hair; it really doesn't bother me. When I'm working and they put a lot of products on, I'll let that stuff stay in for a couple of days and my hair will suffer from it less than if I kept trying to wash it and style it all over again."