"I'm feeling great," Zoe, 39, told PEOPLE when asked if she wanted to clear up pregnancy rumors at Tuesday's Council of Fashion Designers of America and Vogue Fashion Fund fashion show in L.A. She opened her black Balmain blazer to reveal a flat stomach, saying, "Not at all. I'd be home sleeping."
Still, her behavior at the Chateau Marmont had fashion-show attendees buzzing.
"Everyone was drinking champagne at her table but her," said one guest who sat near Zoe.
Shortly after the fashion show ended, as guests sipped champagne and snacked on passed hors d'oeuvres, Nicole Richie approached the table where Zoe was sitting with her sister and a few friends. Though they haven't worked together in years, Richie and Zoe excitedly greeted each other, hugged and proceeded to talk for about 45 minutes.
And babies were a hot topic of discussion. A few minutes into their conversation, Richie, clad in black and white floor length Missoni dress and vintage black beaded cropped sweater, whipped out her BlackBerry and pulled up pictures of her kids.
"It seems like all they talked about was babies," another guest at the event told PEOPLE.
When they were ready to leave, Richie and Zoe, who acted as close as ever, walked out of the event together.