The Sing-Off 'A Pentatonix Christmas Special' featuring Reba McEntire and Kelly Clarkson to air on NBC 11/02/2016 NBC says it plans to air a one-hour holiday special starring Pentatonix on December 14. Read More RELATED NEWS Kirstin Maldonado: I love how Pentatonix inspires young singers'A Pentatonix Christmas Special' featuring Reba McEntire and Kelly Clarkson to air on NBCNick Lachey and Vanessa Lachey welcome baby No. 2 into their family TAGS: The Sing-Off Kelly Clarkson Reba McEntire The Sing-Off
