It's been 20 years since Carrie Underwood won American Idol. In the decades since, she has sold more than 85 million records worldwide and has won more awards, from Grammys to CMAs to Billboard Music Awards,

American Idol” judge Carrie Underwood has surprised viewers with a callback to her time on the show in 2005. At the beginning of Sunday’s episode, Underwood sang “Alone (