NBC says it plans to air a one-hour holiday special starring Pentatonix on December 14.

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"A Pentatonix Christmas Special" will also feature performances by Reba McEntire, Kelly Clarkson and other artists to be announced at a later date.

The famed a capella group -- who won the third season of NBC's "The Sing-Off" a capella singing competition in 2011 -- recently released its third holiday album, "A Pentatonix Christmas."

The vocalists are currently on the final leg of their 2016 world concert tour.