Question: Which American singer and guest star on Austin & Ally performed the song It's Goin' Down in the 2017 film Descendants 2?
Sentence (from "Dove Cameron"): Dove Cameron (born Chloe Celeste Hosterman; January 15, 1996) is an American actress and singer, best known for playing a dual role as both title characters in the Disney Channel teen sitcom "Liv and Maddie" and starring in "Descendants" as Mal, daughter of Maleficent.
Relevant evidence: No