Thou shalt not overmoisturize.
Beautiful skin is hydrated skin, but rich moisturizer will make your makeup fade fast. The solution? Use a moisturizing mask (like Origins Drink Up 10 Minute Mask to Quench Skin's Thirst, $23; Origins.com). Rinse it off and then apply a light moisturizer, avoiding the T-zone areas that tend to get oily. Chanel celebrity makeup artist Rachel Goodwin—who's prepped Jodie Foster and January Jones for the red carpet this season—lets the moisturizer soak in for at least 15 minutes before applying makeup. (The same principle holds for lip balm: Allow it to penetrate for several minutes and then blot away the excess with a one-ply tissue before applying lipcolor.)