The holiday special will air Wednesday, Dec. 7.
In addition to two high-profile TV gigs, the singer is working on her second full-length album.
The Bride's mask came off to reveal Chris Jericho, the former pro-wrestler and singer with heavy metal band Fozzy.
“Man it’s hot as hell in this, but I’m cool y’all,” explained George Clinton.
One of them hails from a popular '90s sitcom and has a top 20 hit on the Billboard Hot 100.
“You are one of the greatest singers of our generation,” Andrew Lloyd Webber said after Mermaid was revealed.
The singer gave his rendition of the track for TV Theme Night on the competition show.
