Former Disney stars Ashley Tisdale and Vanessa Hudgens may have played rivals in High School Musical, but they're thicker than thieves in real life.

To honor her BFF's 28th birthday today (December 14), Tisdale posted a throwback pic that deserves to be displayed at the Smithsonian. Apparently, the duo once donned really bad wigs to "go get food in the venue" without being recognized. Seriously, this photo looks like it came from The Simple Life vault.

"We've done so much together," Tisdale captioned, adding, "You're a gift to us all." Besides making two DCOMs and a feature film together — not to mention working on The Suite Life of Zack and Cody — traveling across the globe, and "play[ing] for 80,000 in South America," Tisdale fondly remembered the more intimate moments all besties share: "heartbreak, love, laughing, crying."

I mean, Sharpay Evans did say she wanted it all and it looks like she got it. Happy Birthday to Gabriella Montez Vanessa!

Hudgens's co-star KayCee Stroh (Martha) also wished her a happy birthday with sweet throwback pics, because once a Wildcat, always a Wildcat.