Vanessa Hudgens, Ashley Tisdale Onboard For Big-Screen ‘High School Musical 3′: Report

After Hudgens' nude-photo scandal, rumors flew that actress would be replaced; Zac Efron, others in negotiations for sequel.

School is back in session for East High seniors Gabriella and Sharpay, as both Vanessa Hudgens and Ashley Tisdale will reprise their roles in “High School Musical 3,” reports UsMagazine.com.

Tisdale, 22, and Hudgens, 18, were under no contractual obligation to return for a third go-round and were both engaged in serious negotiations when nude and revealing photos of Hudgens leaked online in September, sparking rumors that Hudgens would be replaced by either Adrienne Bailon or Sabrina Bryan, both members of Disney Channel’s the Cheetah Girls. (Both are busy, meanwhile, filming their own movie project, “Cheetah Girls 3: Indian Adventure!” )

After Hudgens expressed to her young fans how embarrassed she was over the incident, a Disney Channel spokesperson, who was not identified, came to the starlet’s defense, telling UsMagazine.com, “Vanessa has apologized for what was obviously a lapse in judgment. We hope she’s learned a valuable lesson.”

But getting the right girls for the roles may have come at a price for Disney, as both stars are set to earn “substantial increases in pay,” according to the Web site. Co-stars Zac Efron, Corbin Bleu and Monique Coleman are in negotiations.

Originally slated to be a spooky, haunted adventure , “High School Musical 3″ will instead follow Troy, Gabriella, Chad and the rest of the gang through their senior year at East High, as they sing and dance their way to graduation. The threequel will be the first in the hugely popular Disney series to get a theatrical release.

Check out everything we’ve got on “High School Musical 3.”

Visit Movies on MTV.com for more from Hollywood, including news, reviews, interviews and more.

For breaking news, celebrity columns, humor and more — updated around the clock — visit MTVMoviesBlog.com.

Want trailers? Visit the Trailer Park for the newest, scariest and funniest coming attractions anywhere.