The pic, released on her official website yesterday, reveals baby Zuma as the spitting image of dad Gavin Rossdale and big brother Kingston.
He's already a tiny man about town, heading with his famous parents to cool parties to meet some adoring celeb fans.
Born in August, his full name is Zuma Nesta Rock Rossdale - and brother Kingston is still getting used to having another tiny heartbreaker in the house.
"It's like, here is this guy, and he's not leaving. [Kingston] is getting used to that," dad Gavin told People.
"Obviously, there are moments that he's bugged out that someone is in his spot with his mom."
Gavin himself is finding two kids a real handful, too, saying that "one is one, and two is 10. That's all I know!"
It's OK Gav - we'll come around and babysit! Aaaaanytime!
More celeb babies debuted in our gallery below!