1. Drama High (2009)
2. Drama High: The Play's the Thing (2010)
3. Drama High: Encore (2011)
While there hasn't been an official announcement about a fourth book, it's been several years since the last installment. It's possible that the series is considered completed, but it's also possible that a new book could be released in the future.
To stay updated on any potential new releases, you can follow Carolyn Mackler on social media or check her website for announcements.