Reparto (por orden de créditos)
Justice Alan
Self
Erin Andrews
Kelsea Ballerini
Lola Bell
Ashley Benson
Justin Bieber
Cameron Boyce
Miles Brown
Dove Cameron
Alessia Cara
Sabrina Carpenter
Sofia Carson
Adam Ian Cohen
Mark Cuban
Daya
Dina de la Rocha
Announcer(voice)
DNCE
Themselves
Beverly Duan
J.P. Dubé
Dancer
Tiffany Espensen
Fall Out Boy
Fifth Harmony
Jordan Fisher
Forever In Your Mind
Selena Gomez
Ellie Goulding
Ariana Grande
Frankie Grande
Skai Jackson
Tori Kelly
Zara Larsson
Beorht Lewinski
Self(archiveFootage)
Maddie & Tae
Laura Marano
Vanessa Marano
Marsai Martin
Ryan McCartan
Katherine McNamara
Self - Presenter
One Direction
Rachel Platten
Charlie Puth
Kelly Ractham
Kaycee Rice
Hype Squad
Flo Rida
Aurora Rosselli
Ben Savage
Marcus Scribner
Yara Shahidi
Dan + Shay
Blake Shelton
Silento
Alli Simpson
Jordan Smith
Gwen Stefani
Hailee Steinfeld
Lennon Stella
Maisy Stella
Alyson Stoner
Olivia Stuck
Harry Styles
Taylor Swift
Lauren Taylor
Hudson Thames
Jasmine Thompson
Ashley Tisdale
Emeraude Toubia
Meghan Trainor
Sonika Vaid
Jacob Whitesides
Pharrell Williams