NEW YORK, NY - DECEMBER 02:  (L-R) Pentatonix members Avi Kaplan, Kirstie Maldonado, Scott Hoying, Mitch Grassi, and Kevin Ol
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"Hallelujah"Pentatonix are returning to our TVs with an upcoming holiday gig.

The famous a cappella group is set for A Pentatonix Christmas Special, its very first holiday show, coming to NBC on Dec. 14. Longtime fans remember that the vocal quintet originally came to fame as the Season 3 champions of NBC's a cappella competition show The Sing-Off.

The hourlong show has already booked special guests Kelly Clarkson (who had Pentatonix open for her 2015 Piece by Piece Tour) and Reba McEntire, with other artists being announced soon. Can we put in early requests for Dolly Parton and Tori Kelly?

It's a major moment for the band, who earned their first No. 1 album last year and look set to keep the success going with their recently released A Pentatonix Christmas album. That debuted at No. 3 on the Billboard 200 this week and saw their Leonard Cohen cover of "Hallelujah" debut in the Top 40 of the Hot 100. 

Find out why a cappella is hotter than ever in our special report below: