When Caroline accidentally loses Han's expensive fish while cleaning the tank, Max considers selling a sentimental gift she just received from her mother in order to pay for a new one.
Caroline takes an abandoned bicycle in order to start a delivery service for their cupcake business, but discovers that Max never learned how to ride one.
In an attempt to make some extra money, Max and Caroline decide to rent out their apartment on airbnb. Sophie finds new ways to test Oleg's faithfulness and commitment to their relationship.
Max and Caroline get a bank loan so they can mass-produce their cupcake T-shirts to sell at high-end boutiques. Sophie gets the diner gang to dress up for a holiday decorating contest.
Max and Caroline select a factory to produce their cupcake T-shirts, but become suspicious of the work conditions at the factory after meeting the overly enthusiastic employees.
Caroline is shocked when she receives a Lamborghini for her birthday, which her father ordered for her four years ago. Meanwhile, Oleg has something big planned for Sophie.
Sophie's wedding shower is interrupted by a hostage situation. Max and Caroline's cupcake business gets unwanted attention when a tenant is arrested while wearing their company's T-shirt.
When Sophie takes Max and Caroline shopping for their bridesmaids' dresses, the girls enlist the diner gang's help to hide the ugliest ones, in the hopes of avoiding complete and utter humiliation.
Max and Caroline try to get Nash into the modeling business in an effort to bring in extra money acting as his managers. Also, Sophie and Oleg attempt to keep celibate for 30 days before their wedding.
Max and Caroline's attempt to break Nash into the modeling business comes to a screeching halt when his mother arrives from Ireland to retrieve her son.
Max and Caroline help launch the new branch of The High at JFK airport, and Sophie discovers that Oleg may have an ulterior motive for wanting to marry her.
In the fourth season finale, Max and Caroline are tasked with retrieving Sophie's wedding dress from customs and safely transporting it to the church in time for her big wedding.
