Using a stand mixer fitted with the whisk attachment, whisk the heavy cream on medium-high speed, until stiff peaks form, about 5 minutes. Set aside. I only have one mixing bowl for my stand mixer, so I transfer the whipped cream into a different bowl.
Using the stand mixer fitted with the paddle attachment, beat the cream cheese and granulated sugar together on medium speed, until it is creamy and smooth. Scrape down the sides with a spatula as needed.
Add in the powdered sugar, sour cream, pomelo juice and zest. Beat on medium speed until smooth, about 3 minutes. The cream cheese should be smooth and there should be no lumps.
Using a spatula, gently fold in the whipped cream, adding in ⅓ of the whipped cream at a time. Fold gently, so you don't deflate the whipped cream.
Gently transfer the filling into the prepared pie crust. Using a spatula, evenly spread the filling across, making whimsical swooping patterns on the top. Cover and set it in the refrigerator to set for at least 6 hours, but preferably overnight.
To serve, run knife along the rim of the springform pan to loosen the filing, then remove the rim.