Underwood, who's now serving as a judge on the show, won the show in 2005 Carrie Underwood is throwing it back to 2005. On Sunday, April 6, the "Before He Cheats" singer shared a carousel of never-before-seen pictures from her run on American Idol in 2005.

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

Carrie Underwood is one of the biggest success stories in American Idol history, from her well-deserved win of Season 4 of the show in 2005 to her new gig as one of the judges. But despite just how far she's come,