NICOLE’S NEWEST BABY: Speaking of Nicole Richie, she unveiled her first maternity line, Nicole for A Pea in the Pod, at the chain’s Beverly Drive boutique Thursday night, revealing it took just four months from conception to retail rollout. “I was really excited to do this line because I think the pregnant body is beautiful and I know how difficult it is to change your whole wardrobe just because you’re pregnant,” said Richie, who is expecting her second child this fall. “I wanted to make pieces that I felt didn’t look like classic maternitywear.” The 14-piece collection, ranging from $48 to $148 at retail for black jersey leggings, skirts and tank tops, silk tops and paisley tunics and maxidresses, filled a void for the Philadelphia-based maternity retailer. “This celebrity collaboration is a first, but we’ve been thinking about it for awhile with the pregnant celebrities getting so much attention,” said Rebecca Matthias, president and chief creative officer of A Pea in the Pod. “I think Nicole’s style is very California, so it’s a perfect summer and transitional launch, and different from our other offerings,” she said, adding the collection may continue based on initial sales. That would make Richie a busy woman: In addition to her House of Harlow 1960 costume jewelry line, she also is designing a clothing and shoe line launching next spring.