15. Trent Harmon (season 15) Trent Harmon won what was then the last season of "American Idol," season 15, in 2016. In 2018, Harmon, now 34, released his debut album, "You Got 'Em All," which ...

Underwood will join returning “American Idol” judges Luke Bryan and Lionel Richie. Both Bryan and Richie have appeared on the show since it moved from Fox to ABC for season 16 in 2018.

Some of the world's most iconic singers, including Underwood, Jennifer Hudson and Adam Lambert, got their start on "American Idol," which first premiered in 2002. "20 years ago I auditioned for ...