Pregnant fashion designer Rachel Zoe shared an Instagram photo with fellow expecting mom Gwen Stefani as they flaunted their baby bumps together at an Oct. 17 event.

The friends showed off their growing stomachs when they attended the inaugural gala of the Wallis Annenberg Center for the Performing Arts in Beverly Hills, Calif. Hashtagging her social media post "#majormommymoment," Zoe, 42, joined Stefani, 44, at the charity event where they wore matching-hued royal blue evening dresses, with the singer choosing a sparkling fringe number and the celebrity stylist-turned-designer a more flowing gown.

"Another fun one from moms night out at #wallisannenberg! Isn't @gwenstefani the most gorgeous?" Zoe wrote.

The stars also posed with Nicole Richie and Zoe captioned the shot, "I mean, we're kind of the next Charlie's Angels no? XoRZ #latergram." At the same event Stefani was spotted chatting with new dad Josh Duhamel, who had son Axel on Aug. 29 with wife Fergie.

Gwen Stefani Baby Bump PHOTOS of Red Carpet Debut

Zoe is already mother to son Skyler Morrison, 2, with husband Rodger Berman. She confirmed she was expecting her second child with a post on her website in September. Stefani is mom to sons Kingston, 7, and Zuma, 5, with musician husband Gavin Rossdale.

Stefani has yet to publicly comment on her pregnancy, which was first reported in early September by Star magazine and then later confirmed by rapper Eve, who is a friend of the singer's and longtime collaborator. 

Tags: Gwen Stefani Rachel Zoe