The countdown is officially on.
Luke Null won't return after appearing on the show for one season.
Country star Kacey Musgraves will perform on 'SNL' for the first time.
Cardi B will perform on the sketch comedy show for the first time.
Arcade Fire will perform on the "SNL" stage for the fifth time.
James Bay will perform on "SNL."
"New Rules" singer Dua Lipa is slated to perform.
Troye Sivan will give his first "SNL" performance.
Halsey will perform on the NBC show.
SZA will hit the "SNL" stage with tracks from her Grammy-nominated album "CTRL."
The hosting gig marks Ronan's first time on the sketch comedy show.
The NBC sketch comedy show picks back up on Saturday.
Will Alec Baldwin open the show as Donald Trump?