Guest Stars Sabrina Carpenter as Herself Hailee Steinfeld as Herself Sofia Carson as Herself Ariana Grande as Herself Kelsea Ballerini as Herself Rachel Platten as Herself Alessia Cara as Herself Katherine McNamara as Herself Dove Cameron as Herself Ben Savage as Himself Ashley Tisdale as Herself Yara Shahidi as Herself Vanessa Marano as Herself Cameron Boyce as Himself Lennon Stella as Herself Maisy Stella as Herself Marsai Martin as Herself Marcus Scribner as Himself Ashley Benson as Herself Emeraude Toubia as Herself Maddie & Tae as Themselves Laura Marano as Herself Gwen Stefani as Herself Miles Brown as Himself Justin Bieber as Himself Alli Simpson as Herself Pharrell Williams as Himself Zara Larsson as Herself Mark Cuban as Himself Ryan McCartan as Himself Daya as Herself Zach Levine as Himself (Dr. Zach Levine) DNCE as Themselves Jordan Fisher as Himself Fall Out Boy as Themselves Eric Jacobson as Animal Flo Rida as Himself Jordan Smith as Himself Dan + Shay as Themselves Andy Hurley as Himself Forever in Your Mind as Themselves Jacob Whitesides as Himself Sonika Vaid as Herself