If you've been living under a rock and don't know the relationship between Sia and Maddie Ziegler, let me bring you up to speed really quickly.
Maddie is the girl that dances in almost all of Sia's videos, and a lot of her concerts.
Boom, caught up.
Well for Maddie's Sweet 16, Sia bought her a car!!
And Maddie was VERY excited...rightly so!