As for the attraction, well her character is beautiful, smart, classy, and fits very well into that environment, so I can see why he would find her a good match. Since she has a nice job and probably told him she wanted to move on and distance herself from Danny's lifestyle, I don't see that it would be such an obstacle. Sure, their relationship is largely a plot device, but I don't think there's anything unbelievable about it.
Not sure if your comment was in reply to mine or the guys who posted.
You're entitled to your opinion but like i said - my opinion is that Julia has looked better in other films, for eg, Pretty Woman, Flatliners etc, although they were made 10 years earlier, so she would look better.
In Ocean's Eleven, her overall look was quite ordinary.
My comment is directed towards any man in the history of the world that has ever thought she was hot...I will exclude Lyle Lovett...He gets a pass...those two made a perfect couple...looks wise!
The validity of my answers is highly dependent on the intelligence of the question..or lack thereof.