The series officially ended on January 2, 2011, after the 2nd season, after Lovato completed treatment and left her role.
In Brazil, the show is titled "Sunny Entre Estrelas" (meaning Sunny Between Stars), and the character Sonny Munroe was actually re-named to Sunny. This happened most likely because of the pronunciation.
This was the second Disney Channel original series in which the lead actor/actress left during its run, and the fourth Disney Channel series to have a main cast member leave during its run.