Fruit pizza is best made the same day you plan to serve it. After about 24 hours, the sliced fruit begins to release moisture onto the mousse and it doesn't look quite as pretty. If needed, the cookie crust and cream cheese mousse could both be made a day ahead. Store the crust at room temperature and the mousse in the fridge, and then assemble the pizza shortly before serving. Cover with plastic wrap and store in the fridge.