In a medium mixing bowl, use an electric mixer to beat thee cream cheese on medium speed until smooth. Beat in the ricotta cheese and sour cream just until combined. Stir in the chives, lemon zest, salt and pepper. Scrape it into a serving bowl, cover and chill for at least 4 and up to 24 hours.
Notes
I've kept the calorie/fat content lower by using low fat cream cheese, ricotta cheese and sour cream. You can use full-fat versions, if you prefer.