This week, Who What Wear Beauty Director Erin Jahns is back just in time to prepare us for December’s many celebratory events. The holiday season is the perfect time to experiment with new beauty looks, and whether you’re a beauty pro looking to re-create the year’s biggest runway trends or a makeup novice trying to elevate your look in one simple step, Erin’s got you covered. Plus, she’s recommending which brands to shop for the most festive products and sharing tips for ensuring your makeup lasts all night long.