In "The Knockout Round," two members from the same team are able to sing a song of their choosing one at a time. The artists' coach must then decide which of the two singers should remain on his or her team going forward, and each coach is allowed one "Steal."
NBC's announcement of Clarkson's starring role on The Voice came only a couple of days after reports surfaced in May she was ABC's top choice to sit on the judging panel for the network's American Idol revival, which is scheduled to debut next year.
The Texas-born, Nashville-based singer and songwriter first entered the spotlight when she competed on American Idol in 2002 and was crowned its first champion.
Clarkson boasts more than 25 million albums sold worldwide, and her hits include "Breakaway," "A Moment Like This," "Since U Been Gone," and "My December."
In addition, Clarkson has won 12 Billboard Music Awards, four American Music Awards, three MTV Video Music Awards, two Academy of Country Music Awards, two American Country Awards and one Country Music Association Award.
Her latest album, Meaning of Life, will be released on October 27, 2017.