In the spirit of Valentine's Day, we're taking a look at what the stars have to say about some of Hollywood's hottest couples. And no, not the stars you see on the screen. We've looked to the heavens to get some insight on how these famous duos make it work. Here is our (completely unscientific) look at the compatibility of Hollywood couples, based on their astrological signs. Who do you think is a perfect match?

—Nicole Cammorata, Boston.com Staff

(Astrological traits compiled from astrology.com)