Gwen Stefani and Gavin Rossdale are the proud parents of sons Kingston, Zuma and Apollo, who split their time between their famous mum and dad over the Christmas weekend.MORE: Gwen Stefani makes exciting announcement - and fans can't believe it And while they were with Gavin, the Bush frontman couldn't resist sharing his pride for his children in a heartfelt tribute posted on Instagram.Taking to the popular picture sharing website, the musician uploaded a sweet picture of himself with his three