Two-Tone is the New Tone - Call it a case of indecision or perhaps a love affair with California surfer culture: Two-tone hair is clearly the 'do to rock this season.– Rachel Bilson - Recently jumping on the trend is style star Rachel Bilson. While making the rounds at New York Fashion Week, Ms. Bilson.Kristin Cavallari - It didn't take much for Kristin Cavallari to make the transition to ombre tresses. Fresh from the hair salon in Beverly Hills, the ex-reality star.Pixie Geldof - You can always count on Pixie Geldof to add a little grunge to her style. She went back to her dark roots and added a few hair extensions to create.Alexa Chung - Long before it became the It hairstyle amongst celebs, British TV personality Alexa Chung rocked the trend.