There had been speculation Dolly Parton might join Pentatonix for NBC’s upcoming holiday special, and now it’s confirmed. NBC announced today Parton will join the popular a cappella group during A Pentatonix Christmas Special, set to air Wednesday, December 14 at 8 PM on NBC. The special will re-air Saturday, December 17 at 8 PM.

Earlier this week, the two received a Grammy nomination for Best Country Duo/Group for their a cappella arrangement of “Jolene.” They recently performed the song on The Voice, alongside Parton’s goddaughter and The Voice judge, Miley Cyrus.

Achieving 25 RIAA certified gold, platinum and multi-platinum awards, Parton has had 25 songs reach #1 on the Billboard Country charts, a record for a female artist. She has won seven Grammy Awards, 10 Country Music Association Awards, five Academy of Country Music Awards, three American Music Awards and is one of only five female artists to win the Country Music Association’s Entertainer of the Year Award.

Pentatonix, who first rose to fame as Season 3 winners of NBC’s a cappella singing competition The Sing-Off, has sold nearly 5 million albums in the U.S. alone, winning two Grammy awards. The quintet recently released their third holiday album, “A Pentatonix Christmas”, which debuted at No. 3 on the Billboard 200. The album features the group’s arrangement of the Leonard Cohen classic, “Hallelujah,” which debuted at No. 6 on Billboard’s Digital Songs chart.

You can watch a preview clip of the holiday special above.