Are Josh Hutcherson and Vanessa Hudgens really dating?

I know it's none of my business and I really don't care that much but are they? I heard about this a while back but I didn't believe it and I put it out of my head. Then, I was looking for The Hunger Games movie details and I saw that Vanessa visited Josh where he's filming the movie. It seems like he wouldn't bring her there to distract him unless they were pretty serious. Anyone know the story?