Question: What actress and singer who played a starring role in "Grease" was a special guest during the Mormon Tabernacle Choir's 2015 Christmas shows? 
Sentence (from "Laura Osnes"): She has played starring roles in "Grease" as Sandy, "South Pacific" as Nellie Forbush, "Anything Goes" as Hope Harcourt, and "Bonnie and Clyde" as Bonnie Parker, for which she received a Tony Award nomination for Best Actress in a Musical.
Relevant evidence: Yes