Madonna loves nothing more than being a mother and while she keeps her children primarily out of the spotlight, she occasionally shares glimpses of her family life on social media.MORE: Madonna sparks reaction with new change to appearanceAnd over the weekend, the Vogue hitmaker stunned fans with a new video of her son David, 15, modelling a silk maxi dress and sunglasses.The fashion video looked like it was filmed in the family's home in Portugal, and showed David radiating confidence as he