They say you're not supposed to mix business with pleasure. Apparently, Hollywood didn't get the memo.

Over the years, plenty of married couples have appeared in the same movie. It makes sense, particularly when a husband and wife are portraying romantic interests on screen. (What better way for a director to get chemistry between his two stars then to have it already exist?)

This weekend, "The Five-Year Engagement" hits theaters. Although the stars of the film, Jason Segel and Emily Blunt, aren't dating off screen -- Segel is reportedly going out with Michelle Williams, and Blunt is married to John Krasinski -- it is fun to imagine what would happen if these two were married in real-life. (Just watch the trailer for proof of that.)

In honor of Segel and Blunt's on-screen knot-tying, let's take a look at actual married couples who've appeared in the same flick.

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