Maxim has the “Hot 100.” People has its “Most Beautiful People.” But aside from sitting around a conference table arguing about celebs in bikinis, how do you actually decide who’s the hottest? At Zimbio, we’ve found a foolproof, scientific method for rating a couple’s hotness, based on four categories: Success, Attractiveness, Popularity and Staying Power.

For the first three, we’ve ranked each partner in a couple on a scale from one to 10, then added the two scores to come up with a final number (one to 20) in each category. We ranked Staying Power separately on a scale from one to 20 for each couple. The total of the scores in the four categories determined each couple’s rank on our list. Numbers don’t lie, folks. (read more at zimbio.com.)

Hot Couple #20: Nicole Kidman & Keith Urban
Read Nicole & Keith’s page here.