BLUEBERRY PINEAPPLE SMOOTHIE

2 cups chilled fresh or frozen blueberries, slightly thawed
1 cup chilled pineapple-orange juice, or pineapple-orange-strawberry juice
1 8-ounce carton vanilla nonfat yogurt
1 tablespoon sugar

In a blender container, combine all ingredients.
Cover and blend for 1 to 2 minutes or until almost smooth.
Enough for 3 servings.