Dana Getz
February 26, 2016 at 05:05 PM EST

Following Kelly Clarkson’s heartfelt performance of “Piece by Piece” on American Idol Thursday night, the single has soared to No. 1 on iTunes. Its 2015 album of the same name also shot to a top spot, nabbing No. 3 on the iTunes album chart.

Clarkson, the inaugural Idol winner, returned to the stage Thursday night to christen the final season’s top 10 contestants. She served as a guest judge for the bulk of the evening, later bringing the audience to tears with an emotional rendition of the song, which was written as a mesage to her father and husband.

“It’s just a touching song for me, because I wrote it about my little girl when I was pregnant, and now I’m pregnant with my little boy,” Clarkson said. “I’m pregnant and it’s nostalgic and I can’t believe it’s the last season.”

It was announced last May that this season, Idol‘s 15th, would be the last for the singing competition. Read what former alums are up to here, and check out performances from Thursday night’s show. The series finale will air April 7.

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