Madonna is one proud mom. The legendary pop star, 62, took to her Instagram Story on April 27 and totally gushed about her teenage son, David Banda, 15, and her young daughter, Estere, 8, in a series of videos, which featured the two siblings showing off their dance moves! In the clips, which you can see below, David and Estere looked like expert choreographers going through the motions of their dance set to the Bee Gees iconic hit “Staying Alive.”