A television producer approaches Max and Caroline about shooting an episode of a Kardashians' reality show at their cupcake window.

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.

Max and Caroline's partnership - and friendship - is almost torn apart when Caroline drags Max to a seminar to help brand their cupcake business.

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.

Max, Caroline, Earl and Han help Oleg move into Sophie's apartment - until she begins turning away all of his things.

Max and Caroline are arrested for breaking into a cute guy's apartment to recover the rings Caroline left behind after she spent the night.

Two prep-school girls create and sell imitations of Max and Caroline's cupcake T-shirts.

A customer at the diner is revealed to be a successful photographer who has been keeping a secret.

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.

A handsome businessman, Owen, returns Max and Caroline's missing cat, Nancy, who comes home with a big surprise.

Max and Caroline get a second jobs at a trendy Manhattan restaurant as a pastry chef and hostess to help pay off their bank loan.

Max pursues Nashit, a handsome new waiter at The High, despite Joe's "no hook-up" rule.

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.