Yeah, there have been articles by several sources pretty much ever since Hayden turned 18 saying they were a couple.
It seems as if it's always a "family friend" or a "witness" who's doing the confirming though, so for all we know it might not be true, but if it is indeed true, congratulations to them and I hope people are able to respect their privacy

But I am also worried about the publicity that will come out of this. It could potentially wreck the chemistry between cast members on and off screen, and that's what makes this show so great