It's been 10 years since High School Musical premiered on Disney Channel and 'We're All In This Together' was stuck in our heads.
If you're starting to feel old, then you should probably look away now because you're about to feel a lot older.
Last night, Zac Efron, Lucas Grabeel and Corbin Bleu - who played Troy Bolton, Ryan Evans and Chad Danforth in the movies - reunited and we just can't get over how much they've changed.
Zac and Lucas went to support Corbin's current Broadway show, Holiday Inn Musical, but ended up taking a bunch of selfies on stage instead.
Chad's signature afro is gone and Zac looks fit as hell.
We're also pretty sure that Lucas has not aged in the last 10 years...
Images: Disney, @mrgrabeel, @zacefron