Greg Kinnear and Maura Tierney have joined the cast of Universal Pictures' "Baby Mama," written and directed by Michael McCullers.
The duo join Tina Fey, Amy Poehler, Sigourney Weaver and Dax Shepard in the comedy, which centers on a single woman (Fey) whose desire to have a child and keep her career leads her to hire a surrogate (Poehler).