Cherry-Pineapple Dump Cake

Lightly spray or grease the bottom of 9x13 pan. Drain 1 large can (1 lb 4 oz) of crushed pineapple.  Dump & spread evenly in bottom of pan.  On top of pineapple, dump & spread a can of cherry pie filling.  Sprinkle a yellow cake mix over this.  Drizzle ½ cup of melted butter or margarine over the top.  Bake 50-55 min. at 350 degrees. Sprinkle chopped nuts over top, last 15 min.