"GUYS. This little nugget is starting high school this week. HOW IS THAT POSSIBLE 😳 #LilBroAllGrownUp @diegovelazquezj," Kira captioned the sweet pic.
The Thundermans actors play brother and sister on the show, but it's so nice to see that Kira and Diego are super close IRL. It's adorable how excited Kira is for her on-screen little brother and this major milestone he's about to enter.
What did you think of Kira's cute post? And feel free to wish Diego good luck in the comments section below!