Talk about a tearjerking performance!

Kelly Clarkson belted out her hit song "Piece by Piece" on American Idol's Thursday, Feb. 25 episode — and the song was so emotional it brought her and judges Keith Urban and Jennifer Lopez to tears!

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"I'm pregnant and I'm nostalgic and I can't believe [this is Idol's] last season and I'm really sorry, but I just bawled," the 33-year-old pregnant star — who won Season 1 of American Idol 14 years ago — told host Ryan Seacrest after the crowd gave her a standing ovation.

Watch Kelly's emotional performance below!