Her Backstory: Lauren, 26, started using Sun-In in junior high, moved on to salon highlights at 16, and was a full-on platinum blonde by 20. When we met her, she had graduated to lightening her hair herself, mixing peroxide and bleach at home. "I've always been obsessed with blonde hair, the whole Marilyn Monroe look," says Lauren, who spends much of her time in Los Angeles, surrounded by other platinum blondes. "Over the years, my hair's gotten lighter and lighter...and lighter." The prospect of going darker is terrifying. "My biggest fear about making a change is that I'll look plain, that I won't be noticed," she says. "When you're really, really blonde, you get a lot of attention. It's not always the right kind—but it's attention."