Founded in 1973 by stylists Pierre Ouaknine and Michel Obadia, this sprawling 11,000-square-foot salon is best known for its hair services, which have garnered a devoted celebrity fan base (Uma Thurman and Nina Garcia are both repeat clients). But come Halloween, resident makeup artist Monika Crouch attracts ladies seeking glamorous costume looks ($150–$250) that straddle the line between sexy and scary. In the past, she’s created a vampy dark angel ($150), and a masquerade mask ($200) featuring hand-painted flowers and crystals using Make Up for Ever and Face Stockholm products. Regardless of what you’re after, expect Madame Madeline false lashes to be involved—Crouch is an eyelash specialist, and stocks an abundance of glittery, colorful and spider-style falsies in her makeup kit. As a bonus, those who book with her during the holiday week can score a blowout at the salon for $50 (normally $85) to complete their ensemble.