Jennifer Lopez stars in the ensemble comedy What to Expect When You're Expecting, based on the bestselling 'bible of American pregnancy,' and in an Insider exclusive she says that the movie is just the opposite of the popular book: 'You just never know what to expect,' she says. 'You really, really don't.' Video: Should You 'Expect' Laughs? 'I had just had my own babies; I was very familiar with the book and I thought [of the movie], 'Oh, they're going to take people through what a pregnancy is
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