He should be so lucky!
I would like to know as well but haven't found any press about it. She might be too old for him by now- she's probably about 36. Haven't they been dating for about 10 years? Might be time to trade her in for another in her 20's. (Oh yeah, Caroline Kennedy is married- and way too old for him (~50?)
I read somewhere that they broke up in 2008. She had some kind of illness apparently, and was out of sorts because of it. Neil couldn't handle it, so he broke it off with her.