This is a still of American Idol Season 20 finale on ABC.

This is a still of American Idol Season 20 finale on ABC.

This is a still of American Idol Season 20 finale on ABC.

This is a still of American Idol Season 20 finale on ABC.

This is a still of American Idol Season 20 finale on ABC.

This is a still of American Idol Season 20 finale on ABC.

This is a still of the season finale of ABC's American Idol. Who won?

Lionel Richie appears on American Idol Season 17.

Radio Host Bobby Bones appears on American Idol Season 17 photo shoot.

Ryan Seacrest has been on American Idol for 17 seasons, but he is ominously missing from the cast for Season 18.

Katy Perry poses in a pink dress for an American Idol press junket.

Katy Perry, Luke Bryan, Ryan Seacrest, and Lionel Richie promote American Idol Season 17 for ABC.