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 "It's Goin' Down (Descendants song)"): The song was performed in the film by Dove Cameron, Sofia Carson, Cameron Boyce, Booboo Stewart, China Anne McClain, Mitchell Hope, Thomas Doherty and Dylan Playfair.
Relevant evidence: Yes