Jean Baptiste Lacroix/WireImage; Seth Browarnik/Startraks
2. Be Realistic
Rome wasn't built in a dayand drastic hair color can't be achieved overnight, either. "The more pronounced the change you attempt, the more likely the results will be brassy, ashy or just plain disappointing," says celebrity colorist Kelly Van Gogh. A subtle shift, on the other hand, like Camilla Belle's lift from rich brunet to spicy cinnamon, is completely attainable.