Can you believe that Kingston Rossdale is already 18?! Gwen Stefani and Gavin Rossdale‘s first-born son is officially an adult and the former couple took to social media to celebrate his birthday. Kingston turned 18-years-old on Sunday (May 26) and the former couple also shares sons Zuma, 15, and Apollo, 10. Keep reading to find out more… Gwen wrote on Instagram, “happiest of birthdays Kingston
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