‘High School Musical’ Cast Reflects on Hit Production, Friendships Forged

— -- Some may find it hard to believe “High School Musical” premiered 10 years ago, and the stars of the breakout Disney TV musical reflected with ABC News about what made the production so special.

“My heart is just bursting at the seams ... It's so crazy that it was ten years ago,” star Vanessa Hudgens said in an interview with “Good Morning America.”

The film became a bona fide hit. It turned Hudgens and Zac Efron, among the film’s other actors, into overnight sensations, and it spawned two sequels.

After its release in 2006, "High School Musical" became the first TV movie soundtrack to reach No. 1 on the Billboard Top 200 chart, and went on to become the best-selling album of that year.

Hudgens, Ashley Tisdale, Lucas Grabeel, Corbin Bleu and Monique Coleman reunited on Sunday to reflect on the anniversary for a telecast that will air Jan. 20, the film's official anniversary date.

Hudgens, now 27, described that time as a whirlwind, saying with a laugh: “It felt like we were swept up into this vacuum ... at one point, it literally felt like we were the Beatles.”

Coleman agreed, saying: “Everywhere we went, people knew exactly who we were.”

“Yeah, and now it's like we can go to the coffee store and like we're completely left alone,” Hudgens said, laughing, but Coleman added: “They still want selfies with us.”

Thinking about the anniversary is “amazing,” said Tisdale, who played Sharpay Evans.

“For me, I kind of embrace the I-want-it-all of Sharpay and I'm doing it all so I got a clothing line, a makeup line coming out, producing ... so it's been insane,” she said.

Bleu said the experience taught him that what he does will eventually impact people.

"Just to come back into this room and to see everyone again and to go, 'Oh my gosh. We were all part of this together. We made this incredible magic happen together," Bleu said.

The cast’s first live performance was on “Good Morning America” in 2006.

The actors continue to work on projects from film to TV and Broadway. Despite their new experiences, they remain bound by their time making the film.

“We have tons of other friends but they don't understand what we've been a part of and it's like this connection between all of us,” Tisdale said.

Hudgens agreed that they were all “a package deal.”

Zac Efron, who did not attend the reunion, sent in a special message to fans.

"This is only 10 years," Efron said. "Let's make it a billion more. I love you guys."

The "High School Musical" 10th anniversary reunion telecast will air Wednesday at 8 p.m. ET on Disney Channel.

Disney Channel and ABC News are owned by the Walt Disney Co.

ABC News’ Vanessa Wilkins contributed to this report.