Kiley Dean was a back-up singer for what famous singer, who was also known as the Queen of Pop?
Kiley Dean:  She grew up singing in school and church, which led her to singing back-up for Britney Spears' tours, "…Baby One More Time Tour" and "Oops! Kiley Dean: ... I Did It Again World Tour" as well as Madonna's tours, "MDNA Tour" and "Rebel Heart Tour." Madonna (entertainer):  Referred to as the "Queen of Pop", Madonna is widely cited as an influence by other artists.
Madonna