'American Idol' alums Ruben Studdard and Clay Aiken chat with ET after returning to the show 20 years later for the season 21 finale.
The season 2 stars performed alongside the season 21 finalists.
Clay Aiken tells Ruben Studdard how he came out to himself while filming their season of 'Idol' 20 years ago.
'Idol' alums Clay Aiken and Ruben Studdard interview each other and spill on their new tour, 'Twenty | The Tour,' going until May 16.