Grate one lemon.
Squeeze the lemons for its juice.
Place the cream cheese into a bowl and blend with a hand mixer until creamy.
Then add in the condensed milk and mix until smooth.
Gradually add in the lemon juice and continue to mix.
Add the salt and vanilla extract and mix.
Add the whipping cream and mix.
Lastly add in the lemon zest and mix.
Pour the filling into the ready made graham cracker crust and smooth out the top of the filling.
Cover and refrigerate overnight.
When ready to serve top with whipped cream.