What happened to Taylor Momsen?

When Season 4 of "Gossip Girl" begins, Taylor Momsen is conspicuously absent -- but we have a feeling she's been on her way out for a while. Zap2it can't help but wonder which came first: the slow decline of Jenny Humphrey's behavior, or Taylor's transformation from fresh-faced 14-year-old to Courtney Love wannabe. --Carina MacKenzie, Zap2it
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