As they prepare for a surprise shower, Nick and Abby set up their significant others to keep Billie and Zack occupied. The plan turns into a disaster when the arranged couples don’t get along.

Worried that she’ll ruin Christmas, as she has in previous years, Billie tries to hide from her parents the fact that Zack is living with her. Meanwhile, Abby’s husband, Nick, tries to impress their father. Zack proposes to Billie.

When Billie and Zack take instructional parenting classes separately due to their schedules, Billie goes with Olivia and Abby. However, the course quickly becomes a competition when Abby outshines Billie at all the tasks.

Billie is threatened when James hires another film critic at the paper and sets out to prove how valuable she is.

When Billie starts dating a colleague from her newspaper, Zack is unable to hide his jealousy.

Billie unintentionally causes Abby and Nick to break up when she asks them to be Godparents. However, after a fun night on the town with Davis goes too far, Billie must stop Abby before she does something she will regret.

Billie and Zack have their first big argument after Zack tries to surprise Billie by installing a low flow toilet.

Billie tries to live vicariously through Zack and Davis by offering up dating advice to them. However, things take a turn, when the objects of the boys’ affection reveal their true intentions.

Billie and Zack discuss their feelings on dating and agree to see other people, however, Billie’s pregnancy gets in the way of any potential love connections.

Billie’s pregnancy causes her breasts to increase in size which causes other guys to flirt with her. Meanwhile, Zack refuses to have sex with Billie after she tries to have sex with him.