The proverbial bible of pregnancy has helped millions of soon-to-be parents learn what to do and what not to do before their little one comes into the world. Now, it looks like Lionsgate is setting up a Love Actually-style rom-com that will provide a paycheck to Anna Kendrick, Brooklyn Decker (who made her acting debut in Just Go With It), and comedian Chris Rock.

The whole concept behind the developing film, entitled What To Expect When You Are Expecting, actually sounds like one of Rock's comedy bits. You can almost hear the stand-up sensation barking at his audience, telling them, "You don't KNOW what to expect. You think you know, but you have no idea!" Then he'd repeat it over and over again because that's what Rock does.

Deadline reports that Rock will play an expectant father named Vic, who lectures a group of fellow first-time fathers on what it's really like to have a baby and become a daddy. Decker, one of our favorite ladies of 2011 (so far), plays Skyler, the perky wife of a much older man who's pregnant with twins.

Along with Kendrick (The Twilight Saga: Breaking Dawn), Rock and Decker join the previously cast Cameron Diaz and Jennifer Lopez. Nanny McPhee director Kirk Jones is calling the shots for What to Expect and will deliver the hit on Mother's Day 2012.

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[Via Deadline]