Prepare the cake mix as directed on the box. Pour into a greased and floured 9 x 13-inch pan. Bake according to directions on cake mix box. Let cool.
Spread the peach filling over cake. Beat the cream cheese and milk until smooth. Spread over peach filling. Spread the Cool Whip over pudding. Sprinkle with chopped nuts. Chill 4 hours before serving.
