OK, for every party you have to plan for the guest who is always on a diet, although she weighs as much as I did as a fetus. This should make her happy. And, make you happy because it is super easy.
small carton thawed fat free Cool Whip
8 oz. fat free cream cheese
4 - 5 packets of Splenda (or whatever you swiped from your last trip to Wendy's)
1 tsp cinnamon
Mix together and refrigerate for a bit. Serve with cut up fruit.