29. Scarlett Johansson & Ryan Reynolds
This couple is super-private, having rarely been spotted together since they tied the knot in 2008. We don't know much about their personal lives, but they saw a huge jump our list this year because of Ryan's rising profile. He starred in the summer blockbuster The Proposal, boosting his popularity considerably, and he was cast in The Green Lantern. And Scarlett? We're holding out for Iron Man 2, which is bound to be a hit.