Stir one 8 ounce package cream cheese to soften.
Add 1 cup sifted confectioners' sugar and 1 teaspoon vanilla; beat till smooth.
Whip 1 cup heavy cream and fold into the cream cheese mixture.
Spoon filling into a 9 inch baked pastry shell.
Spoon one 1 pound 5 ounce can blue berry pie filling atop the cheese filling.
Chill until set.