Who said high school was over?

Fans of the hit Disney teen show were treated to a sweet throwback when a rare photo of the cast of High School Musical made the rounds on social media on Sunday.

HSM actor and dancer Jason Williams posted the pic on his Instagram page, featuring a decked out cast that included BFFs Vanessa Hudgens and Ashley Tisdale, Corbin Bleu, Monique Coleman among others.

The crew at @vanessahudgens amazing Halloween party last night! highschoolMusical Reunion!!!! squad squadgoals Halloween hollywood wildcats ?

A photo posted by ?Jason Williams (@jasonwilliams86) on Nov 1, 2015 at 12:07pm PST

Hudgens, who hosted the Alice in Wonderland-themed party, went as sexy Alice, while Tisdale arrived as a sexy Queen of Hearts.

In Wonderland with my woes ???? A photo posted by Monique Coleman (@_moniquecoleman) on Nov 1, 2015 at 12:56am PDT

Coleman looked great as Dionne from the movie Clueless, while Bleu looked every inch a rock star as Lenny Kravitz.

&34;As If&34;

A photo posted by Monique Coleman (@_moniquecoleman) on Nov 1, 2015 at 12:00am PDT

Noticeably absent was Zac Efron a.k.a. Troy Bolt, who played Hudgens’ love interest both on and off screen during the height of the show’s success. Williams captioned the photo with “The crew at @vanessahudgens amazing Halloween party last night! #highschoolMusical #Reunion!!!! #squad #squadgoals Halloween #hollywood #wildcats ?” Tisdale posted several photos of her own featuring herself and other partygoers in various poses.

Adventures in Wonderland…. pic.twitter.com/UfDEtowwep — AshleyTisdaleFrench (@ashleytisdale) November 1, 2015

High School Musical, which first aired on the Disney Channel in 2006, immediately became the most-watched film that the Disney Channel has ever produced. It has spawned three installments, local and foreign spinoffs, a stage musical, book series, video games, and even a reality series.

Hudgens played opposite Efron as the shy and sweet Gabriella Montez, who also happened to be the nemesis of the flamboyant Sharpay Evans, played by Tisdale.

Tisdale played the part of Sharpay so well that Disney decided to produce a spinoff around the character. Sharpay’s Fabulous Adventure was released on DVD in 2011, and focused on Sharpay’s life after graduating high school, and her pursuit of her ultimate dream – landing a role on a Broadway show.

Ashley Tisdale was joined by actors Bradley Steven Perry as her rival and Austin Butler as her love interest.