Audrianna Vargas
This 18-year-old from Sioux Falls, S.D., says the first time anyone heard her sing publicly was at a solo competition in Davenport, Iowa. She finished first out of 30 contestants. Not a bad start, huh? Audri -- that's what she goes by -- graduated from Washington High School last year, but first participated in the school's show choir and played Belle in its production of "Beauty and the Beast...