Step 1 In the bowl of a stand mixer fitted with the whip attachment, or in a large bowl using a hand mixer, whip together the heavy cream, powdered sugar and vanilla until stiff peaks are formed, 3 to 4 minutes. Move to a separate bowl.
Step 2 In the mixing bowl, whip the cream cheese until creamy and smooth. Add the sour cream and lemon zest and continue beating, scraping down the sides of the bowl occasionally until completely incorporated and smooth.
Step 3Fold the whipped cream mixture in with the whipped cream cheese, one half at a time, careful not to overmix. This makes about 1½ cups whipped cream cheese. Cover the bowl with plastic wrap and refrigerate until ready to serve.