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Jessica Alba, 32

Should you start using retinol now that you're in your 30s? Jessica does! This gorgeous actress keeps her skin looking fresh by using Shani Darden Retinol Reform Serum ($95) every night. She's also a fan of the Koh Gen Do makeup line. We can't promise amazing skin like hers, but it's worth a try.

Read More Beauty TipsCelebrity BeautySkin CareJessica Alba