Taylor Swift as Catastrophe Selena Gomez as Arsyn Karlie Kloss as Knockout Kendrick Lamar as Welvin Da Great Martha Hunt as HomeSlice Jessica Alba as Domino Serayah as Dilemma Lena Dunham as Lucky Fiori Hailee Steinfeld as The Trinity Ellie Goulding as Destructa X GiGi Hadid as Slay-Z Hayley Williams as The Crimson Curse Zendaya as Cut-Throat Lily Aldridge as Frostbyte Ellen Pompeo as Luna Mariska Hargitay as Justice Cara Delevingne as Mother Chucker Cindy Crawford as Headmistress