In a bowl, add lemon creme filling (or homemade lemon curd), lemon zest, and lemon juice. Blend until fully incorporated.
In a large bowl, whip heavy whipping cream to stiff peaks. Do not over whip or it will turn into butter. (If desired, reserve 1/2 cup whipped cream for garnish, add 1/2 Tbs powdered sugar to sweeten).
Fold lemon mixture into whipped cream.
Scoop and smooth lemon cream into 9" graham cracker crust.
If desired, pipe reserved whipped cream on top and add small wedges of lemon as a garnish.
Enjoy immediately, freeze for later or store in the fridge until ready to serve.