The winner will be crowned on Tuesday's two-hour episode.
The small taste arrived days after the singer first teased his involvement with the movie.
Meanwhile, all three of John Legend's team members were in the bottom four.
The late actress appeared as Baby Mammoth on this spring's season 7.
SHOWTIME called the series the most-watched premiere in its nearly 50-year history.
Monday night's top 8 performance brought the house down.
The film will premiere exclusively on Paramount+ on Tuesday (Dec. 6).
Alley died of cancer that was only recently discovered, her children True and Lillie Parker said in a post on Twitter.
Grab your umbrellas for this Kellyoke number!
He performed on 'Sing Along With Mitch' and was a teenage idol in Japan before spending 46 years on the iconic kids TV program.
