She may be part of the Gossip Girl crew, but in real life, Taylor Momsen is the farthest thing from preppy. At 17 years old, the actress-slash-singer has already made a strong stance for her hardcore rocker look. And it's one that would be fun to recreate this Halloween. All you need is a platinum blond wig, a slashed tank, thigh-high tights ($8), clunky platforms, maroon lips . . . and a tough chick attitude!