BEAT cream cheese, pumpkin, sugar and pumpkin pie spice with electric mixer on medium speed until well blended. Gently stir in 2-1/2 cups of the whipped topping. Cover and refrigerate remaining whipped topping for later use.
SPOON cream cheese mixture into crust.
REFRIGERATE 3 hours or overnight. Serve topped with remaining whipped topping. Store leftover cheesecake in refrigerator.