Preheat oven to 350 degrees. Using both cans of crescent rolls make 8 squares by joining 2 triangles together for each square. In large bowl beat together cream cheese, sugar, lemon juice, vanilla and sour cream. Spoon mixture in center of each square. Fold up sides of square. Bake for 20-30 minutes until golden brown. To make icing, whisk together confectioner sugar, butter and milk. Drizzle on cooled Danish.