The fifth and final season of The New Adventures of Old Christine premiered on September 23, 2009 and concluded on May 12, 2010. It's consisted of 21 episodes.
In this season, following Barb's arrest she is rescued by Christine, Matthew and new boyfriend Dave. While Richard tries to win New Christine back, he temporarily moves into a new apartment with Matthew. Christine begins going to therapy, but she is attracted to her therapist, Max. They eventually abandon Christine's therapy and strike up a relationship instead. New Christine announces that she is pregnant, causing Richard to rekindle his relationship with her and New Christine eventually gives birth to a baby girl. Meanwhile, Barb becomes engaged to a reluctant Dave. At the conclusion of the season, Christine also becomes engaged to Max, but she feels intimidated by his very educated friends so she decides to return to college.
This season earned two Emmy Award nominations: one for Outstanding Lead Actress in a Comedy Series for Louis-Dreyfus, and one for Outstanding Art Direction for a Multi-Camera Series。