Adam Lambert

American Idol will welcome several former contestants as guest performers on the show's March 15 episode. Among them? Season 8's Adam Lambert, season 10's James Durbin, and runner-up Lauren Alaina, and season 5's Chris Daughtry.

Daughtry, who placed fourth in his season, will debut his new single "Outta My Head," during the episode, according to The Hollywood Reporter.

Ratings: Big Bang Beats Idol overall for the first time

Each of the performers will be promoting their respective albums — Lambert's will be his second, Trespassing, set to drop this spring.