Billy Gilman got an assist from someone who knows a thing or two about TV singing competitions during The Voice Season 11 finale on Tuesday night (Dec. 13): Kelly Clarkson joined Gilman for a performance of "It's Quiet Uptown" from the musical Hamilton.

Both in all black, Gilman and Clarkson sang "It's Quiet Uptown" on a smoke-filled, blue-and-purple-lit stage; readers can press play on the video above to watch their performance. Clarkson -- the original American Idol winner -- sings "It's Quiet Uptown" on the Hamilton Mixtape, which features popular musical artists performing songs from the smash hit musical by Lin-Manuel Miranda.

Gilman skyrocketed to stardom following the release of “One Voice,” his debut single, in 2000; he was 11 years old at the time, making him the youngest country artist to ever earn a Top 40 hit. Gilman’s album of the same name earned double-platinum status, but his following singles and albums did not achieve the same level of success. In November of 2014, Gilman revealed that he is gay — and called out the country music industry to support LGBTQ artists.

When auditioning for The Voice, Gilman landed on Adam Levine's team during the blind auditions. He placed second to Sundance Head.

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