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'AGT: The Champions' Judges Give Teen Courtney Hadwin Standing Ovation for First Original Song (Video)

Season 13 finalist is back and she's not messing around

Teen Courtney Hadwin made her "America's Got Talent: The Champions" debut Monday night -- and debuted her very first original song while she was at it.

When the Season 13 finalist took the stage -- after a brief montage recapped how she was this close to winning the whole thing in 2018 -- judges Mel B, Simon Cowell, Heidi Klum and Howie Mandel were ready to welcome her back with open arms and see what she had prepared for them.

But when Hadwin started to perform, the set got rearranged a little, as the tiny teen with a big voice had a crowd of audience members assemble beneath her like a mosh pit and she began to belt out, "Pretty Little Thing."

She finished to a standing O from the crowd and judges alike, and Mandel in awe when she told him that song -- which he didn't recognize -- was her very own track.

Hadwin isn't the first of the "AGT" finalists and fan-favorites to make an appearance on "The Champions," a special winter edition that is bringing back many a familiar face. Viewers were delighted with the return of Susan Boyle last week and Darci Lynne Farmer last night, along with many others.

Watch her performance above.

"America's Got Talent: The Champions" airs Mondays at 8/7c on NBC.