Even more proof that all celebrities want to be designers: Nicole Richie’s trying her hand at a jewelry line. The new mom tells People that she’s creating her own collection with the help of Mouawad, which also happens to be the company that produces supermodel Heidi Klum’s collection. Says Nicole, “It’s all costume jewelry. I like to play with jewelry and mix and match.” Launching a jewelry line is a logical move for Richie, who’s been fabulously fashion-forward ever since she and BFF Paris Hilton grew out of their Simple Life days. Her hubby, Good Charlotte frontman Joel Madden, is also no stranger to the fashion world, running his own rock-inspired DCMA Collective brand with his brother (and Hilton’s new squeeze) Benji. So with both parents keeping so busy, who’s taking care of baby Harlow? “Everyone’s been really mellow and able to work around my schedule,” Richie says. “If I need to go feed the baby, I do it.” Here’s to multi-tasking Mamis!