[Answer] With a reported 66 million records sold, which winner of "American Idol" is the show's best-selling contestant ever?

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With a reported 66 million records sold, which winner of "American Idol" is the show's best-selling contestant ever?

• Carrie Underwood:Carrie Underwood rose to prominence after winning the fourth season of American Idol in 2005. With over 66 million records sold worldwide, Carrie Underwood is the top-selling artist in the American Idol franchise. The eight-time Grammy Award winner has 28 #1 singles, 12 Billboard Music Awards, 17 American Music Awards, five Guinness World Records and inductions into both the Hollywood Walk of Fame and the Grand Ole Opry. She is also the seventh highest-certified female artist and the highest-certified female country artist of all time.

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