We've always admired Christina Ricci's ability to look both stylish and personable, especially with black hair and icy eyes that make "approachable" a relative word. But when Ms. Ricci showed up last night at Donna Karan's studio on Greenwich Street, we sort of gasped. She was wearing a ladylike bombshell of a dress, bright red, with a silver star pendant and an adorable smile. That was all fine. But then there was Christina's new hair, which is now a buttery brown color with yellow streaks, sharp curves, and the unmistakable shape of an Editrix bob. That's right - Christina Ricci got Anna Wintour's hair. We sort of love it, but we've also got to know: Is she gunning for a Vogue spread in the near future?