Halle says that on her off days, she doesn't really wear any makeup. I saw an interview with a makeup artist that did her makeup and he said that she has one of the best, natural skin complexions in Hollywood (lucky bitch! LOL!! As if she couldn't be anymore perfect already, sheesh)
I would also like to know what her secret is too. Probably plenty of water, exercise, fruits and vegetables and the best dermatologist that money could buy. She always has such a gorgeous glow to her.