Exclusive: Watch Meg Donnelly Perform a Holiday Classic With 1 Extremely Lucky and Talented Superfan

If you're ready to get even more into the holiday spirit, then mark your calendars for Challenge Accepted! Disney Channel's Epic Holiday Showdown airing on Dec. 6. The holiday special will feature some of your favorite Disney stars as they take on some festive and zany holiday-themed challenges — including a special performance from Zombies 2 star Meg Donnelly as she sings "Joy to the World" alongside an extremely lucky superfan, 14-year-old Kia Mills.

"Meg Donnelly is my idol and she has an amazing voice," Mills shared with POPSUGAR. "It was so surreal to sing with her, it felt like a dream." It also just so happens that Kia's voice is equally as insane, and their performance just might be your new favorite rendition of the iconic song. POPSUGAR has an exclusive sneak peek of their performance in the video above, and you can watch it all go down this Sunday, Dec. 6 at 7 p.m. ET on Disney Channel!