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Gwen Stefani and <\/span>Gavin Rossdale are celebrating the 18th birthday of their eldest son, <\/span>Kingston, with sweet tributes.<\/span><\/p>\n On Sunday, the teenager marked his leap into adulthood by having his rockstar parents post commemorative messages \u2014 accompanied by some adorable photos \u2014 to their Instagram pages.<\/span><\/p>\n Stefani, 54, used her post to upload dozens of pictures and videos of Kingston throughout the years, ranging from his newborn days to today, set to UB40\u2019s \u201cKingston Town.\u201d<\/span><\/p>\n \u201chappiest of birthdays Kingston\ud83e\udd0d my first born baby boy \ud83d\ude42 cannot believe u are 18 today\u2026 i love u! \ud83e\udd70,\u201d the No Doubt singer wrote in her post.\u00a0The former couple \u2014 who split in 2015 \u2014 also share sons Zuma, 15, and Apollo, 10.\u00a0<\/span><\/p>\n For his part, 58-year-old Rossdale shared a simple carousel featuring numerous pictures of Kingston, starting with a recent snap of the 18-year-old walking under what appears to be a cherry blossom tree while holding up an umbrella.\u00a0<\/span><\/p>\n \u201cHAPPY BIRTHDAY KINGSTON -18 today and a massive step into your future.so far the best ride of my life and i can\u2019t wait to see where you go from here.i have total belief in you and deeply admire the man within.you have grace, charm and humility,\u201d the Bush frontman wrote.<\/span><\/p>\n He continued, \u201cYou are at the wheel of your destiny so choose wisely. your musical talent is nuts and soon the world will hear your heart sing.follow your muse,stay curious and keep creating.i could not love you more than i do.i wish you all the happiness all the health and all the creativity.\u201d<\/span><\/p>\n Other pictures included in the post show Kingston alongside his brothers and older sister, Daisy Lowe \u2014 whom Rossdale welcomed with his ex, Pearl Lowe \u2014 as well as the teenager enjoying the outdoors and smiling alongside his girlfriend, Lola Albert.\u00a0<\/span><\/p>\n In response, Kingston took to the comments to thank his dad for the loving post, writing,\u00a0\u201cbest dad ever.\u201d<\/span><\/p>\n While Rossdale recently opened up about <\/span>his \u201cdebilitating\u201d divorce from Stefani in the 2010s, the pair have kept things amicable in the pursuit of successfully co-parenting their three sons.\u00a0<\/span><\/p>\n Since their separation, they each have gone on to find new relationships: Stefani with husband\u00a0<\/span>Blake Shelton\u00a0and <\/span>Rossdale more recently with his musician girlfriend,\u00a0Xhoana Xheneti.<\/span><\/p>\n In April, ET\u2019s Cassie DiLaura <\/span>spoke with Shelton, 47, and the singer shared that despite not having any kids of his own, he has fully accepted his wife\u2019s three boys as his children.\u00a0While he has known the boys since 2014, the singer officially took on the title of stepdad in July 2021 when he and Stefani\u00a0<\/span>tied the knot, less than 12 months after he\u00a0<\/span>popped the question.\u00a0<\/span><\/p>\n Shelton told ET that Kingston, Zuma and Apollo have changed him\u00a0\u201cin every possible way.\u201d<\/span><\/p>\n \u201cI learned quickly, not because anything happened, but just, you know, reading the room, you\u2019ve really got [to think], \u2018I have to take a step back,’\u201d Shelton said of his mindset shift while stepping into the role of stepdad. \u201cWhen people say it\u2019s not about you anymore when you have a kid\u2026 I think, if you\u2019re doing it right, it\u2019s not about you anymore. That\u2019s true.\u201d<\/span><\/p>\n