In the fourth season opener, Bonnie and Adam's relationship is tested when he moves in with her and Christy for a few weeks. Also, Christy learns the hard way that it may be a mistake to try and meet men with Jill.
Christy considers giving up her dream of becoming a lawyer when Bonnie's ex-girlfriend, Jeanine, offers her a lucrative job in real estate. Also, Adam is very curious about Bonnie's past with women.
Christy annoys everyone when she adopts her new boyfriend Brad’s healthy lifestyle, and Bonnie and Adam decide to take the next step in their relationship.
When Marjorie takes a break from the group, Bonnie becomes the go-to for everyone's problems and Christy tries to overcome a painful memory from her past.
Christy and Jill take Emily to see her biological mother, Natasha, in rehab where they make a surprising discovery, and Bonnie watches Adam’s dog while he’s out of town.
In the season finale, Christy tries to help when Bonnie gets into trouble with the IRS but, realizing she’s in over her head, she encourages Bonnie to seek help from her newfound brother, Ray.