Funny thing we've noticed: Style pros like Mark Ronson and Ryan Gosling have been clowning around with bleach. We're not talking about Justin Timberlake's Britney-era frosted tips. We're talking about a whole-head commitment. But is it right for you? "When I proposed platinum to Mark, he was instantly on board," says Martial Vivot, the stylist behind Ronson's coif. In other words, if you're fickle, just say no. This look must be fully owned.