These signs are pasted up on Seventh Avenue in Park Slope between Garfield Street and Carroll Street, where they will be shooting Baby Mama this week. It’s a comedy with Sigourney Weaver, Amy Poehler, Tina Fey and Dax Shepard and is directed by Michael McCullers. It’s described by IMDB as follows: ” A single professional woman (Fey) opts to hire a surrogate mother (Poehler) so she can have a baby and keep her career on track.” The movie is due out next year.