Gwen Stefani's oldest son Kingston Rossdale paid the sweetest tribute to his big sister Daisy Lowe this week as she celebrated her birthday in lockdown.MORE: Gwen Stefani's fiancé Blake Shelton is unrecognisable with long hair The No Doubt star's firstborn took to Instagram to post a sweet throwback photo of himself as a toddler holding hands with his model sibling, and wrote alongside it: "Happy birthday @daisylowe.