Recurring Guest Characters Olivia Rodrigo 1 guest appearances SZA 1 guest appearances Niall Horan 1 guest appearances OneRepublic 1 guest appearances Sabrina Carpenter 1 guest appearances Jelly Roll 1 guest appearances Doechii 1 guest appearances Paul Russell 1 guest appearances Melanie Martinez 1 guest appearances David Kushner 1 guest appearances AJR 1 guest appearances Pentatonix 1 guest appearances Big Time Rush 1 guest appearances Cher 1 guest appearances