American Idol loves bringing back past contestants and Sunday night's show will feature a bumper crop of them.

Starting Sunday, April 2 on ABC, American Idol alums Justin Guarini, Clay Aiken, David Archuleta, Jordin Sparks, Phillip Phillips, Catie Turner and Noah Thompson will return to the show to guide the contestants through the always-challenging Hollywood Week.

In case you need a refresher, Justin was the runner-up on season 1, while Clay and David were the runners-up on seasons 2 and 7, respectively. Jordin and Phillip were the winners of season 6 and season 11, respectively, while Catie was a top 10 finalist in season 16 and Noah won season 20.

Speaking to Billboard about his mentor experience this season, Clay said, "Going back was shocking to me ... There were a number of contestants on the show who were not born when I was on Idol. I kept saying to people that it's like I imagine Miss America 1940 must feel if she is still alive."

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