Guest Stars Sabrina Carpenter as Herself Hailee Steinfeld as Herself Kelsea Ballerini as Herself Alessia Cara as Herself Veronica Dunne as Herself Nathaniel J. Potvin as Himself Lindsey Stirling as Herself Erin Bowman as Herself Noah Cyrus as Herself Grace VanderWaal as Herself Julia Michaels as Herself Fitz and the Tantrums as Themselves Train as Themselves