Taylor Swift Well, maybe not dirty, she does appear to be lying down on a blanket!

X17 photogs caught the country cutie collapsed while shooting scenes for her guest appearance on CSI -- we never knew the girl could act, (after all, getting cozy with hotties like Justin Gaston and Stephen Colletti on video shoots could hardly be considered "acting"), but we can't wait to see what the CSI writers have cooked up for her!