Katie Holmes was fresh out of a wholesome Midwestern high school existence when she became an overnight sensation in the WB’s anchor teen drama “Dawson’s Creek” (1998-2003). Her real life naiveté and lack of pretension lent a quality of realism to the smartly scripted small town chronicle, which was a much-needed shift away from the previous wave of TV high schools populated by wealthy, Southern California fashionistas. Down-to-earth Holmes and her naturalistic acting style were an integral factor in the success and six year-run of “Dawson’s Creek,” but the actress’s transition to the big