A new episode of Hannah Montana will air on September 14 called Joannie B. Goode.
Here's the plot summary:
Miley and Lilly must learn to make peace with their arch rival, Joannie once Oliver decides to date her. However, when Lilly and Joanie learn that they have lots in common, Miley fears that she’s losing her two best friends. Jackson is spooked by images of Rico while dating his cousin.