Should I let my ex niece move in with me now that I am divorced?

Me and my ex-wife have been separated for about 3 or 4 months (the divorce just went through a few weeks ago) and her niece and me always had a thing for each other (we never did anything but we hung out a lot and flirted but like I said never did anything, but it was obvious that we had an attraction to each other)...anyway now that the divorce is final we have been out for drinks and well we have had like non stop for the last couple weeks and have become really close really fast. Now she is thinking maybe she should move in. We all (including my ex and her aunt) live in the same town so it won't stay a secret for very long if we do move in. We really do like each other a lot and just click, but I'm still kind of feeling guilty about having with my ex-wife's niece so soon after the divorce...and having her become my serious GF/live in...she is smokin hot and I do like her a lot, should I just over look the point of her being me former niece and just go with it? BTW I am 27 and the niece just turned 18.