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When she was 19, Pickler auditioned for American Idol in the fall of 2005 in Greensboro, North Carolina. She sang both Kelly Clarkson's "Since U Been Gone" and Martina McBride's "A Broken Wing". The judges sent her to Hollywood. Pickler advanced through the semi-finalist rounds in February. On March 9, she reached the Top 12.
Pickler was among one of judge Simon Cowell's favorites. He once predicted Pickler would be in the final three, and said he preferred her over the previous season's winner, Carrie Underwood. Recognized for her "quirky" personality and Southern charm, Pickler gained attention on the show by saying (for example) that she had hardly ever performed before real audiences, and mispronounced words.