The movie's director, Kenny Ortega (Jenna Ortega's father) told Deadline recently that the actors will get together to perform "We're All In This Together."
Kenny revealed that Vanessa Hudgens, Ashley Tisdale, Corbin Bleu, Monique Coleman and Lucas Grabeel will all "participate in one way or another".
We aren't sure what exactly that means, but it does mean that exes Vanessa and Zac will be in contact again!
The reunion comes after Vanessa, Corbin, Ashley and other cast members reunited on a Zoom chat over the weekend, which Vanessa teased on Instagram.
"Guess who’s back..." she wrote as the caption!
In addition to the HSM reunion, the Disney singalong will include other stars lik Raven-Symoné from Cheetah Girls, as well as the cast of The Descendants, Zombies, and High School Musical: The Musical: The Series. Ariana Grande, Demi Lovato, and Charli D'Amelio!