Ah, sisterly love.
Though they might not always get along, Dance Moms veteran Maddie Ziegler took to Instagram to share a cuter-than-ever throwback photo in honor of her younger sister Mackenzie's birthday.
"Happy birthday to my amazing little sister! As much as you annoy me, I love u so much," she captioned the sweet pic.
The girls have grown up quite a bit since they first graced our television screens back in 2011. Click through to see how much Mackenzie and the rest of the cast has changed!