Gwen Stefani shared a childhood photo of herself alongside her son, Zuma, and fans couldn’t believe their eyes. The Hollaback Girl songstress, 50, wished the youngster a happy twelfth birthday by sharing some throwback snaps of not only him but her as well, leaving her followers startled at the resemblance. "He is your mini-me," wrote one, while others branded them "twins".Gwen is sporting a hat and a coy smile in her photograph, while Zuma - in a cute picture from a few years ago - had a