Pumpkin Chiffon Pie

2 small packages vanilla sugar-free instant pudding
1 1/2 cups milk
1 small can pumpkin
2 teaspoons pumpkin pie spice
2 cups Cool Whip

Blend vanilla pudding and milk with mixer. Add in pumpkin  and pumpkin pie spice. Fold in Cool Whip. Blend well. Pour into 2 (8-inch) baked shells. Chill 4 hours.