Gwen Stefani is a doting mom to three sons, who are growing up quickly! The No Doubt hitmaker shares Kingston, 17, Zuma, 14, and Apollo, nine, with ex-husband Gavin Rossdale.What's more, the trio are set to become uncles for the first time any moment now - as their oldest sibling, Daisy Lowe, is expecting her first child with fiancé Jordan Saul.Daisy is due to welcome her first child imminently, revealing last week that she was in fact 36 weeks pregnant.VIDEO: Gwen Stefani and Gavin Rossdale's rarely-seen son Zuma steals the showShe posted a picture of herself with her blossoming baby bump, and wrote: "36 weeks of growing you".The British model celebrated Mother's Day in the UK on Sunday, she opened up about becoming a mom for the first time in a heartfelt tribute to her own mother, Pearl Lowe, ahead of giving birth.MORE: Gwen Stefani's sons face challenging time in family as fans send supportMORE: Gwen Stefani expands her family as she introduces adorable new additionIn a lengthy message, she wrote: "A love letter to my mum- I’ve always known that you were a very unique mum @pearllowe You wore see stilettos at the school gates & you were always so painfully cool & a good decade or two younger than everyone else’s mum. We listened to Nirvana, Portished, Elastica & Carly Simon together.A post shared by Daisy Lowe (@daisylowe)Gwen Stefani's sons' sister Daisy Lowe is expecting her baby at any time now!"You dressed me in lace dresses and dr Marten boots & I haven’t really taken them off since."Our bond is so special… You have always been my best friend.