Oh, baby! The big-screen adaptation of the popular parenting guide "What to Expect When You're Expecting" is shaping up to be quite the star-studded spectacular.

Jennifer Lopez, Chris Rock and supermodel Brooklyn Decker have all been cast in the film, which stars Cameron Diaz as a fitness instructor.

According to Entertainment Weekly, Lopez will play Holly, a woman who has trouble conceiving and decides to adopt a child from abroad; Decker stars as a NASCAR driver's wife whose worry-free pregnancy with twins inspires envy in  her fellow moms-to-be.

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