Tisdale, 30, took to Instagram and shared a picture of the gang along with Ortega, who directed the 2006 teen romantic-comedy musical television film, reported E! Online.
"All of us supporting the guy that changed our lives," Tisdale wrote with the gang. So proud of @kennyortegablog on his big night," the "Scary Movie 5" actress captioned the picture.
Grabeel, best known for his role as Ryan Evans in the film series, also shared a photo with the team.
Coleman, 34, hailed Ortega as a visionary and said he was proud of the film.
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"Tonight was indescribable! I don't have enough words to describe how amazing #Descendants was or how proud we all are of @kennyortegablog and the incredible cast!
"#KennyOrtega is a visionary and he captured pure magic on the screen! I'm so grateful I got to share tonight with my family! #wildcatreunion #HSM."
Actor Zac Efron could not attend the premier as he was promoting his new movie "We Are Your Friends" while actress Vanessa Hudgens was busy shooting a new campaign.