Lemon Blueberry Trifle

block (8 oz) cream cheese, softened

boxes (3.4 oz each) instant lemon pudding mix

milk

tub (8 oz) whipped topping, thawed

Angel food cake (2 loaves or 1 tube cake), cut into 1-inch pieces

(3-4 cups) fresh blueberries

Sliced lemon, for garnish (optional)