Zac Efron and Vanessa Hudgens' Original 'High School Musical' Auditions Are Beyond Adorable

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Disney Channel's megahit High School Musical celebrated its 10th anniversary on Wednesday with a super cute reunion special, which included a look back at some of the cast's insanely adorable audition tapes.

During their nostalgic visit to the East High gymnasium, HSM stars Vanessa Hudgens, Ashley Tisdale, Corbin Bleu, Lucas Grabeel and Monique Coleman took a trip down memory lane while watching their hilariously cheesy auditions together.

WATCH: Ashley Tisdale Opens Up About 'High School Musical' Reunion: 'We All Still Love Each Other'

While Tisdale's audition with Grabeel and Bleu's audition with Coleman were all kinds of cute, seeing a teenaged Hudgens run lines with a shaggy-haired Zac Efron was one of the highlights of the special.

RELATED: 'High School Musical' Turns 10 Years Old! Cast Reflects on Surprise Disney Smash

Even back then, there was clear chemistry between the young stars, who famously dated for five years after meeting on the HSM set.

Efron, however, didn't make it to the reunion, and his absence was noticeable -- especially since none of the cast mentioned his name while watching the auditions and they don't show Efron delivering any lines in the flashback.

WATCH: Zac Efron Struggles to Remember the Name of a 'High School Musical' Tune

The 28-year-old star said he wasn't able to make it to the reunion due to his busy schedule promoting his new film, Dirty Grandpa, however he did prerecord a message for his fans. Still, the gesture wasn't enough for many HSM lovers who slammed the actor on social media for skipping the 10th anniversary celebration.

Check out the video below for more on the blowback Efron has received for missing the long-awaited reunion.