Breaking celebrity hairstyle news: Nicole Richie is back to blond. "Last night we played Clueless," she wrote. Colorist George Papanikolas took Nicole from a chocolate brown hue to the lighter shade shown here. "Usually I recommend doing a transition from dark hair to light blond hair over the course of a few months to maintain the dignity of the hair," he says. "But Nicole was over being a brunette, and was determined to be a blonde, so instead we did it over the course of a week with several sessions." Thinking of making a similarly drastic change? George says that deep-conditioning is a must (he recommends Joico K-Pak Deep Penetrating Reconstructor, $19) throughout the process.