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 also starred in the title role of Rodgers & Hammerstein's "Cinderella" on Broadway, for which she received a Drama Desk Award and her second Tony Award nomination for Best Actress in a Musical.
Relevant evidence: No