In a big bowl mix cream cheese and sour cream together. Then add sugar, 1/3 cup pecans, and vanilla.
Gently stir in 1/8 cup brown sugar.
Add the grapes and stir gently until mixed in well.
Sprinkle with remaining pecans and brown sugar.
Refrigerate until ready to serve.
Notes
You could easily make this dish a day in advance and it would taste just as good, if not better, on day two. Making it ahead of time may also depend on your choice of fruit.