Best Grape Salad

I got this recipe from a coworker at the salon I work at. I didn't think it would be so wonderful and addictive! It's very creamy and sweet, and a great mix of flavors. It will be the best thing you ever use grapes for (except maybe wine!).
Ingredients:

2 lbs green seedless grapes
2 lbs red seedless grapes
8 ounces sour cream
8 ounces cream cheese, softened
1/2 cup granulated sugar
1 teaspoon vanilla extract, to taste

Topping Ingredients

1 cup brown sugar, packed, to taste
1 cup crushed pecans, to taste

Directions:

Wash and stem grapes.
Set aside.
Mix sour cream, cream cheese, white sugar and vanilla by hand until blended.
Stir grapes into mixture, and pour in large serving bowl.
For topping: Combine brown sugar, and crushed pecans.
Sprinkle over top of grapes to cover completely.
Chill overnight.