Cosgrove will perform “Raining Sunshine” for the end credits of the movie, based on the popular children’s book, which arrives in theaters Sept. 18 and stars the voices of Anna Faris, Andy ...

The iCarly star, 16, who performs the song “Raining Sunshine” for the end credits of the animated film, will debut the full video Saturday at 8 p.m. (ET/PT) on Nickelodeon.