Despite sporting a banging post-baby body at a private party in West Hollywood for her manager, Benny Medina, over the week, Nicole Richie’s Gloomy Gus persona in the weeks since giving birth to daughter Harlow Winter has friends worrying that she may be having a hard time adjusting to being a new mom, according to OK! Magazine.

“Nicole’s situation is reminicent of that episode of Sex and the City where Miranda wants to be a good mom but isn’t sure how to do it exactly,” a friend of Nic’s tells OK!

“She keeps a food diary,” a source reveals to OK!. “She writes down everything she eats and figures out where she can cut calories. She tries to joke about counting her caloric intake, but everyone knows she’s very serious about getting her body back.”