‘I’m very nervous but I’m very excited at the same time,’ 16-year-old contestant tells MTV News before the season 11 finale. By Kara Warner, with reporting by Kelly Marino Jessica Sanchez on the “American Idol” finale red carpet Photo: Getty Images It’s all come down to this: the finale of the 11th season of “American Idol” , with 21-year-old guitar-strumming southern gentleman Phillip Phillips pitted against 16-year-old vocal powerhouse Jessica Sanchez. There are endless sports-related clich