Zac Efron is celebrating his 29th birthday and his High School Musical co-stars could not let this day go by without reminding how special he is to them. Ashley Tisdale and Monique Coleman have written him the sweetest messages on social media to celebrate his big day.

Ashley tweeted a picture with a caption saying:

Monique shared a photo with a sweet message saying: "Happy Birthday @zacefron ✨?I'm always proud of you, always rooting for you & eternally grateful for all the memories. I hope your last 20 is your best yet! Xx"

We love that the HSM crew is still so close, even if so much time has passed since the movies came out. We were secretly waiting for Vanessa Hudgens to say something, but maybe that will happen toward the end of the day. We can dream, right?!

Can you believe Zac is almost 30 years old?! Tell us in the comments!