Gwen Stefani Celebrates Her 'First Born Baby Boy' Kingston's Milestone Birthday

Zuma Rossdale, Gwen Stefani, Blake Shelton, Apollo Rossdale and Kingston Rossdale

Gwen Stefani was one proud mama as her son, Kingston, celebrated a milestone birthday.

On Sunday, May 26, the No Doubt singer took to social media to share a touching tribute to her eldest child, whom she shares with her ex-husband, Gavin Rossdale.

"Happiest of birthdays Kingston🤍 my first born baby boy :)," Stefani, 54, captioned her Instagram update. "Cannot believe u are 18 today… i love u! 🥰."

The post featured a montage of video clips and photos starting from when Kingston was a newborn and ending with recent photos—and Stefani's Instagram followers couldn't get enough of the sweet memories.

"Omg crying! Happy birthday Kingston," one fan wrote. "You’ve grown into such an amazing young man ❤️."

Another Instagram user commented, "Happy birthday to your first born! I have watched him 'born to blossom' and now he’s such a handsome young man! Great job on doing such a great job in raising your boys! 💕."

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Yet another fan shared, "I don't know if other ND fans feel like his aunt in a weird way or not, but we've all watched him grow and you've done such an amazing job! He seems to really love and respect his girlfriend which is so lovely to see. Happy birthday to him! 🎂❤️."

Meanwhile, model Daisy Lowe wrote, "This video! 🥹🥹🥹 what a wonderful young man you have created & raised. Happiest birthday magic @kingsrossdale_ & happy 18th anniversary of being a super mum ❤️❤️❤️."

Still others noted how much Kingston resembles his father, with one person declaring, "Gavin's twin big time," and another writing, "Image of his father."

In addition to 18-year-old Kingston, Stefani shares sons Zuma, 15, and Apollo, 10, with Rossdale.

Next: Blake Shelton Shares How Life Changed After Becoming a Stepdad to Gwen Stefani’s Kids: ‘It’s Not About You Anymore’