Guest Stars Taylor Swift as Herself Dua Lipa as Herself Shawn Mendes as Himself Camila Cabello as Herself Jennifer Lopez as Jennifer Lopez Halsey as Herself Post Malone as Himself Khalid as Himself Zedd as Himself Cardi B as Herself Liza Koshy as Herself Mariah Carey as Herself Brendon Urie as Himself Panic! at the Disco as Themselves The Chainsmokers as Themselves