Once upon a time, Katherine Heigl was in a movie called Knocked Up. It was a romantic comedy, and it was good. Since then, Katherine Heigl has appeared in 27 Dresses, The Ugly Truth, and next week’s Killers. They are romantic comedies, and they are less good. The new trailer for Life As We Know It suggests Heigl will continue her streak of appearing in less-than-good romantic comedies. In the grand tradition of Three Men and a Baby and Raising Helen, Life As We Know It finds Heigl and her exact male equivalent, Josh Duhamel, raising an infant together after the baby’s parents die, despite the fact that they don’t like each other very much. You will be shocked to hear that this dislike does not last long. Heigl plays yet another type-A personality; Christina Hendricks appears briefly as the doomed mother; and there are at least three poop jokes. Enjoy.