Successful and single businesswoman Kate Holbrook has long put her career ahead of a personal life. Now 37, she's finally determined to have a kid on her own. But her plan is thrown a curve ball after she discovers she has only a million-to-one chance of getting pregnant. Undaunted, the driven Kate allows South Philly working girl Angie Ostrowiski to become her unlikely surrogate. Simple enough. After learning from the steely head of their surrogacy center that Angie is pregnant, Kate goes into precision nesting mode: reading childcare books, baby-proofing the apartment and researching top pre-schools. But the executive's well-organized strategy is turned upside down when her Baby Mama shows up at her doorstep with no place to live. An unstoppable force meets an immovable object as structured Kate tries to turn vibrant Angie into the perfect expectant mom. In a comic battle of wills, they will struggle their way through preparation for the baby's arrival. And in the mid dle of this tug-of-war, they'll discover two kinds of family: the one you're born to and the one you make.  - skip ad - Genres: Comedy Running Time: 1 hr. 36 min. Release Date: April 25th, 2008 (wide) MPAA Rating: PG-13 for crude and sexual humor, language and a drug reference. Distributor: Universal Pictures Distribution Cast And Credits Starring: Tina Fey, Amy Poehler, Sigourney Weaver, Dax Shepard, Greg Kinnear Directed by: Michael McCullers Produced by: Jill Messick, Louise Rosner, Ryan Kavanaugh

Although it certainly sets the stage for some fertile comedy, "Baby Mama" -- which pairs successful Philadelphia exec Tina Fey with her decidedly white-trash surrogate, Amy Poehler -- never fully delivers.

Backed by a crackerjack supporting cast, including Sigourney Weaver and Steve Martin, the new millennium take on "Baby Boom" serves up plenty of smart, knowing laughs early on, but by the time it hits the third act (or would that be trimester?), it barely crawls to the finish line.

In his feature directorial debut, screenwriter Michael McCullers knows how to craft a decent zinger, but his loopy brand of urbane humor really cries out for the skills of a seasoned comedy director with a proven knack for crucial things such as pacing and momentum.

The end result still should play very respectably with its targeted female audience -- especially those who can identify with Fey's ticking clock -- but it will likely fall short of Judd Apatow levels.
Fey makes an effective transition from her Emmy-winning "30 Rock" character to that of Kate, the unmarried vice president of Round Earth Organic Market, the Whole Foods-esque chain presided over by an amusingly Zen Steve Martin.

The only thing missing in Kate's life is a baby, and after being informed by a fertility specialist that her odds of getting pregnant run about one in a million, she opts to visit a pricey surrogacy center run by the imposing Chaffee Bicknell (a wonderful Sigourney Weaver).

But the woman chosen to carry her child -- Poehler's gum-cracking, cocktail-swigging Angie Ostrowiski -- couldn't be more different from buttoned-down Kate, and when the plot mechanics require that the two share close living quarters, the inevitable "Odd Couple" shenanigans ensue.

McCullers, who once shared an office with Fey when they were both writing for "Saturday Night Live," manages to nail her wry sensibility while finally giving Poehler a feature platform worthy of her considerable "SNL" talents.

Unfortunately, his inexperience behind the camera is evident in too many missed comic opportunities -- either he steps on the laugh by hurrying a clever bit of business or weighs it down by giving it one beat too many.

Luckily, his expert cast, also including Greg Kinnear as Fay's fruit smoothie-dispensing potential love interest, Holland Taylor as her strongly opinionated mother, Dax Shepard as Poehler's scheming common-law husband and Romany Malco as an all-seeing doorman, manages to keep this baby sufficiently entertaining.