Baby Mama is an upcoming comedy film directed by Michael McCullers starring Tina Fey and Amy Poehler.
Here the official trailer of Baby Mama:
"Kate Holbrook (Tina Fey), a successful single businesswoman, has put her career before her personal life. At the age of 37, she has finally decided to have a child on her own, but her plans change when she discovers she has only the slimmest chance of becoming pregnant. Instead, Kate gets a South Philly working girl, Angie Ostrowiski (Amy Poehler), to become a surrogate mom.
When Angie becomes pregnant, Kate begins preparing for motherhood in her own typically driven fashion--until her surrogate shows up at her door with no place to live. As these polar opposites struggle together, they must also prepare for the upcoming birth of the baby." (Source: Wikipedia)
Don't know why but I would have thought about Whoopy Goldberg too in a such a comedy!