|CUT cantaloupes in half; remove seeds. Scoop round balls of cantaloupe out of each half with melon baller or small round spoon, leaving about 1/2 inch of cantaloupe in the melon.
COMBINE cantaloupe balls, strawberries and blueberries in large bowl. Mix Juicy Juice, lemon juice and sweetener in small bowl; pour mixture over fruit mixture and toss lightly.
LINE cantaloupe halves with frisée or lettuce leaves. Spoon fruit mixture into each cantaloupe half. Cover; refrigerate until ready to serve.