Preheat oven to 350 degrees.
Stir together cake mix, butter and nuts in large bowl until crumbled; set aside.
Spoon pie fillings randomly in ungreased, 13-by-9-inch baking dish, without mixing them together. Sprinkle lemon juice over fillings. Sprinkle evenly with cake mix mixture.
Bake about 45 minutes or until golden brown. Serve warm with ice cream. Makes 12 to 15 servings. Enjoy!