In a large bowl, beat the room temperature cream cheese with an electric mixer on medium-high speed for 2–3 minutes until completely smooth and fluffy.
Add the powdered sugar, vanilla extract, and lemon juice. Beat again until fully combined and smooth, about 1 minute.
In a separate cold bowl, whip the heavy cream on high speed until stiff peaks form, about 3–4 minutes.
Gently fold the whipped cream into the cream cheese mixture in two additions, using a rubber spatula. Fold until just combined — do not over-mix.
Pour the filling over the chilled crust and spread into an even layer with an offset spatula or the back of a spoon.
Cover with plastic wrap and refrigerate for at least 6 hours, or overnight.