Preheat oven to 350F
Cook shells according to packaged directions and drain very well.
Meanwhile, in large bowl, mix next 5 ingredients.
In a sauce pan over low heat, mix suace and cream untill blended smooth.
Lightly spread suace over 9x13" baking pan.
Fill each shell with cheese mixture to top and place side by side in pan.
Top with shrimp, sauce, and toasted pine nuts, if using.
bake for 30-45 minutes, turning once untill heated through.