Gerardo Mora/WireImage; Courtesy of Altoids; Time Inc. Digital Studio; Courtesy of Chanel
While it's tempting to overstuff, keep your purses lean and tidy by bringing only the essentials. Along with mints, lipstick, powder and perfume, celebrity stylist Nicole Chavez recommends clients such as Scarlett Johansson and Rachel Bilson carry a small packet of Kleenex. "Someone always needs tissue at some point in the night," says Chavez. "You can get emotional or just need some extra padding."