2 (14 oz.) cans sweetened condensed milk
3 heaping tbsp. Cool Whip
1/3 c. + 2 tbsp. lime juice (key lime)
Cool Whip for topping (whatever amount is desired)
Pie crust

Combine all ingredients (except Cool Whip for topping). Whip until thick. Pour into baked pie crust or graham cracker crust. Spread with remaining Cool Whip topping. Refrigerate 2 hours before serving.