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SLICE 1 cup strawberries; halve remaining strawberries. Set aside. Add boiling water to gelatin mixes in large bowl; stir 2 min. until completely dissolved. Add ice to cold water to measure 2 cups. Add to gelatin; stir until ice is completely melted. Refrigerate 5 min. or until slightly thickened.
MEANWHILE, line bottom of 13x9-inch dish with cake. Add sliced strawberries and 1 cup blueberries to thickened gelatin; stir gently. Spoon over cake. Refrigerate 4 hours or until gelatin is firm.
BEAT cream cheese and sugar in large bowl with whisk until well blended. Stir in COOL WHIP; spread over gelatin. Arrange strawberry halves on cream cheese mixture to resemble stripes of flag. Add remaining blueberries for stars.