Lemonade Cheesecake: 1 pkg. (8 oz.) PHILADELPHIA Cream Cheese (softened), 1 tsp. Lemonade Flavor Drink Mix, 1/4 cup cold milk, 1 tub (8 oz.) COOL WHIP Topping (thawed), 1 ready-to-use graham cracker crumb crust (6 oz.). BEAT cream cheese and drink mix in large bowl with mixer until well blended. Gradually add milk, mixing until well blended. STIR in COOL WHIP; spoon into crust. REFRIGERATE 4 hours or until firm.