Heroes' Hayden Panettiere Is An American Everywoman

Even though Hayden Panettiere turned 18 last August, we're wondering, is the Heroes starlet a teenager or an adult? We ask only because Hayden is on the cover of three different Hearst girly magazines for April 2008: There's Cosmopolitan ("Fun • Fearless • Female"), which, according to demographics, has a medium… » 3/06/08 2:00pm 3/06/08 2:00pm