Has Taylor Swift gone brunette? No, it's just a wig -- part of her costume for guest-starring as a troubled teenager on 'CSI: Crime Scene Investigation.' This photo of the 19-year-old singer (and now actress!) was snapped earlier this week on the set of the popular TV drama.

Swift will play the part of Haley Jones, a girl whose family operates a seedy Las Vegas motel. There's no word yet on when her 'CSI' episode will air.

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