Two of American Idol's most famous names are returning to the show to perform in this year's series finale. Kelly Clarkson and Carrie Underwood will come back for the last of three finals on April 7. Clarkson won American Idol in 2002, while Underwood triumphed in 2006.​ Clarkson returned to Idol last month to perform an emotional rendition of 'Piece By Piece', which saw her reducing everyone to tears with the delicate arrangement.​ The singer also sat alongside Jennifer Lopez, Keith Urban and Harry Connick Jr at the judges' table for the live Top 10 show this season​.
