Raspberry Lemonade

2 cans (12 ounces each) frozen lemonade concentrate, thawed 

2 packages (10 ounces each) frozen raspberries, partially thawed
4 tablespoons sugar
2 liters Sprite
Ice cubes

In a blender, combine lemonade concentrate, raspberries and sugar.  Cover and process until blended. Strain to remove seeds.  In a 4-1/2-qt. container, combine raspberry mixture, Sprite and ice cubes.  Serve immediately.