Smile Written by Katy Perry, Brittany Talia Hazzard (as Brittany "Starrah" Hazzard), Ferras Alqaisi, Oligee (as Oliver "Oligee" Goldstein), Josh Abraham, Vin Rock (as Vincent Brown), Benny Golson, Anthony 'Treach' Criss (as Anthony Criss), DJ Kay Gee (as Kier Gist) Produced by Josh Abraham, Oligee & G Koop Performed by Katy Perry Courtesy of Capitol Records, LLC