Prepare cake batter and bake as directed on package for 24 cupcakes, following the reduced-fat directions. Cool in pans 10 min.; remove from pans to wire racks. Cool completely.
Meanwhile, beat pudding mix and milk in medium bowl with whisk 2 min. Stir in COOL WHIP. Refrigerate until ready to use.
Frost cupcakes with pudding mixture. Arrange 5 berry slices on top of each to resemble star; fill centers with blueberries.