1Heat oven to 350°F (325°F for dark or nonstick pan). In large bowl, stir cake mix, butter and nuts until crumbly; set aside.
2In ungreased 13x9-inch pan, spoon pie fillings randomly, without mixing them together. Sprinkle lemon juice over fillings. Sprinkle cake mix mixture evenly over fruit.
3Bake 35 to 40 minutes or until golden brown. Serve warm with ice cream. Store loosely covered.