Glee good girl Dianna Agron upstaged by vampish co-star Teresa Palmer at I Am Number Four premiere

By ANDREA MAGRATH Gleeful girlfriends:Glee star Dianna Agron and her I Am Number Four co-star Teresa Palmer get cosy at the film's premiere in Los AngelesShe plays good girl cheerleader Quinn Fabray in the hit show Glee, and Dianna Agron stayed true to form for the premiere of I Am Number Four, her first starring role, last night.But while the 24-year-old was lovely and ladylike in a cream cock...