April 8, 2016 10:41 AM EDT

Mississippi singer Trent Harmon may have won season 15 of American Idol on Thursday night, but season one winner Kelly Clarkson stole the show.

As part of a pre-taped concert that aired during the finale on FOX, the Grammy Award-winning singer performed a medley that included her greatest hits, such as “Stronger,” “Miss Independent,” and “Since You’ve Been Gone.”

The 33-year-old pop star, who is expecting her second child, joked on Twitter: “Who’s that sweaty, pregnant girl singing?? ….oh snap that’s me hahaha!! #ohwell”

 

Write to Olivia B. Waxman at olivia.waxman@time.com.

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