Nas Tried To Mend Fences With Kelis

You'll recall, Kelis filed for divorce from Nas in April 2009 and the split was nuclear. The two warred non-stop over custody of their son and money. Kelis said when she was 7 months pregnant she was broke yet Nas refused to give her a penny -- even for medical expenses.

Now, Nas tells TMZ, the two are trying to put the past behind them in order to develop a healthy relationship for the benefit of their 3-year-old son Knight -- but they are NOT reuniting romantically.