Ariana Grande will host "SNL" for the third time on Dec. 20. The Academy Award-nominated and Grammy winning multi-hyphenate stars in "Wicked: For Good," in theaters Nov. 21.
Cher will take the stage as musical guest for the second time following her first appearance in 1987. The Oscar, Emmy and Grammy Award winner's autobiography, "Cher: The Memoir" is currently available in paperback.