Special Guest Stars One Direction as Themselves Guest Stars Boogie as T-Bo Charles Dewayne as Drummer Rain Gregorio as Guitarist Chloe Csengery as Bethany Kyle Matthew Hamilton as Keyboard Player Co Starring Kristi Clainos as Justine Sean Smith as Dr. Dresdin Uncredited Harry Styles as Himself Zayn Malik as Himself Liam Payne as Himself Louis Tomlinson as Himself Niall Horan as Himself
