In the season premiere, Rachel Zoe, Inc. is growing exponentially, and so is Rachel’s family. With a baby on the way, Rodger looks for a bigger house, while Rachel sets her eyes on launching her new fashion line. After an Elle Magazine photo shoot with her hubby, Rachel and Rodger jet off to a round of interviews for a potential new junior stylist to replace Brad. Hoping she’ll slow down and take it easy, Rachel tries to manage it all leaving Rodger concerned for her health and well-being.

It's back to the Big Apple, where Rachel and Rodger are set to unveil her first collection to the fashion industry's heavyweights. With a packed three-day schedule, Rachel's newest hire, Jeremiah, tries not to crack under pressure in his first big job as the newest member of the Rachel Zoe team. Rachel also recruits her friend Joey to help out, who she eventually tries to persuade to move to LA and work with her full-time. With all of the moving pieces and all eyes on her, will Rachel make the cut and make a seamless transition from stylist to designer

With her skills of persuasion, Rachel convinces Joey to move to Los Angeles to become her right hand fashion man. While he helps Rachel style a Kim Kardashian video shoot, Jeremiah must shift his focus from fashion design to interior design and is responsible for furnishing Rachel and Rodger’s new house. With life moving in the fast lane, Rachel's sister visits to put things in perspective and remind them that a baby is on the way. After a visit to a doula, the topic turns ugly with an argument over Rodger's new role in the company. To make matters worse, he tells her he needs a weekend away to de-stress.

Rachel is busy planning for the Oscars, but when she gets sick, Rodger and her sister Pam worry Rachel's finally gotten too busy.

Jeremiah handles his first major gig, but wonders just how much time he has left at Rachel Zoe Inc.

It's couture shock when Rachel goes into labor. This causes a frantic rush to prepare for the baby's arrival and triggers the hiring of a former staffer to finish the nursery. Elsewhere, Joey braves his first solo style job by dressing actress Molly Sims in New York.

Season 4 closes with a juggle struggle, as Rachel tries to balance her work demands with her role as a new mother. Unwilling to part with her baby boy, she brings him to work with her. Meanwhile, an opportunity comes Jeremiah's way.