Prepare the white cake mix according to the package instructions. Allow it to cool completely.
In a bowl, whisk together the instant vanilla pudding mix and milk until thickened.
In another bowl, whip the heavy cream with powdered sugar and vanilla extract until stiff peaks form.
Fold the whipped cream into the pudding mixture to create a light filling.
Slice the cooled cake into layers and assemble with alternating layers of filling and fresh strawberries.
Refrigerate for at least 4 hours before serving.