Simpson will also be shooting a music video that will incorporate footage from the film, Lia Vollack, president of Worldwide Music for Sony Pictures announced Monday.
"'La Da Dee' is a bright, fresh, fun song that strikes the perfect tone to end 'Cloudy with a Chance of Meatballs 2.' Cody is a wonderful and talented recording artist who appeals to kids and their parents alike -- he's a perfect fit with the world of the film," Vollack said in a statement.
The song is the lead track on Simpson's new album, "Surfers Paradise."
"Cloud with a Chance of Meatballs" is due in North American theaters Sept. 27.