Think blondes have more fun? Check out these sultry brunettes and think again. According to colorist Marie Robinson, whose clients include Natalie Portman and Anne Hathaway, the best shades of brown and black right now are natural-kicked up a notch. "It's about enhancing, not extremes," she says. "Most of these celebrities are within two shades of their natural color, whether it's a tiny bit lighter or darker."