Kate Hudson is a doting mum to three children, and the Hollywood star can't quite believe how quickly time is going!Ahead of her oldest son Ryder's 17th birthday on 7 January, the actress took to Instagram to reflect on motherhood in an emotional post. MORE: Goldie Hawn's appearance confuses fans in festive family video Sharing a picture of herself with Ryder on New Year's Eve, Kate wrote: "This young man made me a mother my entire adult life and I wouldn't change it for the world...