A fourth installment of Disney's High School Musical is in the works.

"We are writing High School Musical 4," Disney Channel Worldwide President Rich Ross told the Hollywood Reporter Tuesday.

Vanessa Hudgens, Zac Efron, Ashley Tisdale, Lucas Grabeel, Corbin Bleu and Monique Coleman are headed to Utah later this month to shoot High School Musical 3: Senior Year, the first in the series to hit the big screen in October.

Ross said "all the cast" may not return for the HSM4, but that some new characters may be introduced in HSM3.

While recently promoting her Degree Girl contest, Tisdale, 22, told Usmagazine.com that "we love HSM, but we kind of have to move on.

"It will always be a part of us that we loved to do" she added. "All of us have gone through so much together, like winning the Billboard award and an Emmy and an American Music Award! That’s something that we’ll always remember!"

Where does Tisdale (who topped Us' Best Makeover List last year) see her career going?

"I'd love to do more romantic comedies in the future," she told Us.

Her inspiration? "Kate Hudson — she's funny!"