I have enough evidence now. They are dating. Who kisses their friend on their birthday at a twilight convention? And look at the video comments here: http://www.youtube.com/watch?v=Y4GWaLSGNfs Enough evidence for you? Look at this photo: Note the body language? Friends don't tend to do that. Others rumors are that on the Twilight set everyone called them hubby and wifey. What more do you want?