Reba McEntire has invited Wynonna Judd to be Team Reba's Mega Mentor during the Knockout Rounds on The Voice. She made the announcement on social media, sharing a video of herself and Wynonna backstage onset. As a Mega Mentor, Wynonna will provide insight and inspiration to Reba's contestants as they head into the next round of competition on The Voice. She will appear on the show Monday (Nov. 6) on NBC.