Ryan Dillon Elmo Voice David Rudman Cookie Monster Voice Carmen Osbahr Rosita Voice Hoda Kotb Guest Blake Lively Guest John Mulaney Guest Andy Cohen Guest Jonas Brothers Guest Jason Sudeikis Guest John Oliver Guest Olivia Wilde Guest Mykal-Michelle Harris Guest Pentatonix Music Performer "Nature" Nick Jacinto Guest Joyous String Quartet Guest Ciara Guest Josh Groban Guest Kacey Musgraves Guest Ben Platt Guest H.E.R. Guest Benjamin Lehmann Executive Producer Mindy Fila Executive Producer