Christina Aguilera came up short in the big game, and now she's opening up about her musical mishap.The pop star sat down with Ellen DeGeneres for an interview set to air Tuesday, and along with talking about her new NBC show "The Voice," Aguilera addressed her infamous Super Bowl mishap, in which she flubbed the lyrics to the Star Spangled Banner."I had been singing that song my entire life. I was the youngest anthem singer in my hometown of Pittsburgh, PA.