American Idol's Carrie Underwood shared another surprise in her recent Idol to Icon episode, citing a major prediction from former judge Simon Cowell.

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.

If American Idol finalist Mattie Pruitt wants to stick around, she may want to consider Carrie Underwood‘s advice. The country superstar and former American Idol winner actually offered two notes of criticism during Sunday night’s (April 27) show.