From Aliens in the Attic to birthday tributes on the 'gram.
"Happy birthday buddy @austinbutler!!!" the actress, 38, wrote on Instagram on the big day. "I love you so much and so excited to celebrate with you. You are always inspiring me and I'm so grateful that I still have you in my life. My twin forever and always thank you for being the best uncle to Juju! Have the best day!!"
Along with the note, Ashley shared a series of snapshots of the pals from over the years. The photos included a picture of Austin smiling with a birthday treat, an image of the two dressing up for Halloween, throwbacks of them working on their 2009 movie Aliens in the Attic and 2011 film Sharpay's Fabulous Adventure as well as pics of them hanging out with her husband Christopher French and 2-year-old daughter Jupiter.
Of course, the birthday tribute should come as no surprise to their fans as Austin—who also dated her High School Musical co-star Vanessa Hudgens for about nine years—and Ashley have celebrated many milestones together, including his Oscar nomination for his role in Elvis.
And the revelation didn't necessarily have Austin all shook up.
"She called me," the Dune: Part Two actor, who is now dating Kaia Gerber, told Access Hollywood shortly after hearing the news. "I almost wasn't surprised. It kind of made sense, you know? We've been close for a long time, and I love her a lot."