American Idol's Carrie Underwood has been getting blamed for problems that already existed on the show, but there are several issues she didn't cause.

Carrie Underwood gave fans a blast from the past by performing "Alone" on "American Idol," two decades after doing so on the show in 2005.

Carrie Underwood chats with ET backstage at 'American Idol' after the show celebrated its own iconic moments, with contestants performing songs made famous by the show and its biggest stars. Carrie reflects on reuniting with some of her fellow season 5 singers and reacts to fellow winner Fantasia's advice for season 23's hopefuls.