Gwen Stefani, pregnant with her third child, hides her baby bump under a long, baggy black tank top while she and husband Gavin Rossdale step out with son Zuma. Credit: MEKA/

With another one on the way, Gwen Stefani is on mommy duty! The 43-year-old No Doubt singer, expecting her third child, was spotted stepping out with husband Gavin Rossdale and their 5-year-old son, Zuma, on Wednesday, Sept. 11.

The stylish star hid her burgeoning baby bump under a long, draped black tank top that gathered over her stomach and exposed her black bra underneath. She accessorized the sexy top with rolled-up Paige Denim jeans, bright yellow flat, an animal-print fedora and shades. Stefani held hands with son Zuma while walking through a parking lot together.

Us Weekly confirmed on Sept. 4 that Stefani and Rossdale, 47, married since 2002 and parents to son Kingston, 7, and Zuma, were expecting again. "It's very new and they just found out," the source told Us. "They're excited!"

The "Wind It Up" singer expressed last year that she had given up on her hopes of having another child. "I really, really, really wanted one about two years ago. And it didn't really work out," she told Marie Claire in October 2012, without explaining further. "So . . . I feel good with what we've got. Everything works out how it should. You can't plan anything, right? You can try."