"Keep Smiling" is a song from The Amazing World of Gumball from the episode "The Joy" sung by Gumball Watterson and Darwin Watterson.
Lyrics
Gumball: My cheeks are begging me to stop! But my heart! My heart says keep smiling homie!!
Lucy Simian: (spoken) How dare you sing in my class!
Darwin: (spoken) I'm sorry but since this morning
I think there might be something strange with us, maybe!
Lucy Simian: (spoken) What is wrong with you?
Gumball: If joy like this is wrong, then gosh darn it I don't wanna feel right, baby!
Trivia
- This is the first song Jacob Hopkins and Terrell Ransom, Jr. sang as Gumball and Darwin, if one discounts the song "Welcome to Elmore."