Has a Sex and the City star been caught doing the dirty deed on film? Kristin Davis (aka Charlotte York-Goldenblatt) reportedly has a sex tape floating around out there, and this particular scene wasn't meant for major motion picture audiences. At the moment, only the photos have leaked -- which you can see here (warning: the images do not include innocent Pinkberry frozen yogurt, and are decidedly NSFW!). While her rep is saying "This is......