Have you ever seen a woman on the street and thought, Her skin is glowing! I wonder what she uses? As a beauty writer, that is a natural—and common—question for me. My voyeuristic side is dying to get a peek inside the bathroom vanities of random strangers. This strange urge prompted me to speak with 15 beauty insiders—including dermatologists, skin-care brand founders, beauty bloggers, and actresses—to find out what products they use every morning.