Clarkson was one of several guests on the 2-hour show, which also featured performances by Ed Sheeran, Meghan Trainor, Sheryl Crow, Luke Bryan John Fogerty and more.

Hawthorne finished in fourth while Sawyer Fredericks claimed the season 8 title. On Sunday, Clarkson delivered the debut live performance of her latest single, "Invincible", at the 2015 Billboard Music Awards in Las Vegas.

The tune, from her 7th album, "Piece By Piece", follows the project's lead single, "Heartbeat Song", which peaked at No. 21 on the US Billboard Hot 100.