Blake Shelton is not the biological father of Gwen Stefani’s middle child, Zuma. But there is no question that the emerging country singer bears a strong resemblance to his country star stepdad. Stefani shared a photo montage to celebrate Zuma’s 16th birthday on Thursday (August 22), and as he has aged over the years, Zuma’s similarities to both Shelton’s style and looks have definitely become more pronounced. During the time since Stefani and Shelton first started dating, Blake’s country influence on Zuma’s style is quite prominent, with Zuma beginning to regularly wear a cowboy hat while playing guitar more frequently. The likeness between Shelton and Zuma is crystal clear in one recent photo of the two of them together. “Happy sweet 16, Zuma!! We love u SO much,” Stefani wrote in the caption of her post. (Taste of Country)