Gwen Stefani’s eldest son, whom she shares and co-parents with her ex Gavin Rossdale, recently celebrated his 18th birthday. Both doting parents took to Instagram to share endearing birthday tributes to their handsome son which had fans debating on which parent he resembles the most. In addition to Gavin, the beloved teen also has Blake Shelton as his stepdad. Musical superstar Gwen Stefani and her rocker ex-husband Gavin Rossdale just celebrated a monumental birthday. The loving mom and dad’s eldest son, Kingston Rossdale, turned 18 years old over the weekend and received the most heartwarmin…
