Anna Paquin and Stephen Moyer vs. Nina Dobrev and Ian Somerhalder: Who Is the Hottest On-and-Off Screen Couple? (PHOTO)

In Hollywood, it’s common for co-stars to hook up. However, it’s rare to see two celebs stay together for years, and even more unusual to see them get married.

Anna Paquin and Stephen Moyer have literally been together since the beginning of True Blood. They began dating when they filmed the pilot in 2007, got married in 2010, and are about to welcome twins in this Fall!

Maybe it’s a vampire thing, but there is one other set of co-stars that is red-hot right now: The Vampire Diaries’ Nina Dobrev and Ian Somerhalder. The pair has been dating since late 2010, and although they’re not married yet, they are always attached at the hip in photos together, so we wouldn’t be shocked if a wedding was in their future.

Now, here’s the tough part: We want you to choose which couple you love more! Vampire lovers, weigh in below!

Alyse Whitney is an editor at Wetpaint Entertainment. Follow her on Twitter @AlyseWhitney.