If you've spent any amount of time on Facebook, you've probably seen the adorable little girl from that one viral meme.While her hilarious facial expression is frozen in time on the internet, she has actually grown up—and it will probably make you feel very old. Mia Talerico, of Disney's Good Luck Charlie, just started third grade. On Tuesday (September 5th), Mia shared a precious first day of school photo on Instagram. She's growing up so fast — and even has braces now. Too cute!Unsurprisingly, Mia's TV brothers also grew up. Bradley Steven Perry (Gabe Duncan) graduated from high school back in May, along with other Disney Channel stars, and Jason Dolley (PJ Duncan) got a Bachelor of Arts in philosophy from California Lutheran University just last year. Meanwhile, Mia's TV sister, Bridgit Mendler (Teddy Duncan), went to the University of Southern California with her mom. Good to see the Duncan clan are still hanging in there.