Gwen Stefani showed off her growing baby bump in a skintight back dress via a selfie on Twitter Credit: Courtesy Gwen Stefani

Gwen Stefani knows how to work a baby bump! The No Doubt singer, 44, looked super-chic -- and super-pregnant -- in a selfie she shared via Twitter on Tuesday, Jan. 21.

Posing in front of a mirror with her iPhone, the third-time mom-to-be showed off her growing belly in a form-fitting black Seraphine tunic over black leggings. Never one to sacrifice style, she paired the outfit with sky-high strappy sandals.

"Bump it," she captioned the glam pic, adding the hashtags "#allblack," "#inappropriateshoes," "#capturethemoment," and "#miracle."

Stefani -- already mom to sons Kingston, 7, and Zuma, 5, with husband Gavin Rossdale, 48 -- revealed via Instagram last week that she and her family are expecting another baby boy. (A source confirmed to Us Weekly in September that she was pregnant with her third child.) 

"I was ready to hand over the crown," the "Sweet Escape" singer wrote alongside a photo of herself wearing a bejeweled headpiece. "But I guess I am still queen of the house. #itsaboy #surroundedbyboys"