They may seem innocent enough on TV, but the stars of "Glee" show that even good students can be bad.  Lea Michele, Dianna Agron and Cory Monteith have stripped down to spice up the November issue of GQ magazine.  Michele and Agron, who play Rachel Berry and Quinn Fabray, don racy schoolgirl outfits as they pose with Monteith, who plays school jock Finn Hudson.  The stars also dish on everything from body image to dropping out of high school...  just what GQ readers, I'm sure, would like to read...  oh brother!