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Temps are on the rise, and we’re totally stoked—except for the fact that our hair has morphed into a perpetual frizz ball and our makeup keeps melting off just as fast as we can reapply it. So in an effort to keep bad hair days and greasy skin at bay, we hit up model-actress Molly Sims for her tricks on looking sexy all summer—because if anyone knows how, it’s her. You’re welcome.