Ten years ago, Zac Efron sang his way into America's hearts as the basketball player turned musical star in High School Musical.

Since the last movie premiered, fans have been waiting for the gang to team up and prove that they really are in this together. Yesterday, Zac met up with his former co-stars, Corbin Bleu and Lucas Grabeel and posted a pic to Instagram.

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Zac and Lucas went to see Corbin in his new musical, "Holiday Inn." He even added the hashtag "#theboysareback."

We can't wait to see who he reunites with next!