The contestants’ voices are the most important part of the show, but at the end of the day, American Idol is about producing a star, so the look is also vital. Once the live rounds begin, the upped production value is evident, and that’s because wardrobe, hair, and makeup come into play in a much bigger way by that point in the show.

Underwood won Season 4 of the singing competition show in 2005, and recently returned for Season 23 as a judge.

During Monday's episode of "American Idol," Carrie Underwood shared a heartfelt testimony after contestants went head-to-head during a performance of Brandon Lake's "Gratitude."