Whip the cream cheese until fluffy.
Add the zest, vanilla, juice of half a lime (about 1 tablespoon), and the lemon juice and combine until smooth and fluffy again.
Add about 1 teaspoon of Splenda, mixing in.
In a separate small bowl, whip the whipping cream until it forms stiff peaks (lightly sweeten with Splenda and a dash of vanilla).
Fold into the cream cheese until mixed well.
Taste for desired sweetness, folding in more Splenda if required.
Separate into 2 cups and set in fridge to chill.
Serve as desired, topped with whipping cream, nuts, etc.