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