Melt butter in large nonstick skillet on medium heat. Add leeks; cook and stir 3 min. or until slightly softened. Stir in wine; cook 3 min. or until most of the wine is cooked off. Add spinach; cook 1 min. or just until wilted. Add 1/4 cup cream cheese product and milk; cook and stir 2 to 3 min. or until cream cheese is completely melted and mixture is heated through. Remove from heat; cover to keep warm.