1Heat oven to 350°F (325°F for dark or nonstick pans). Place paper baking cup in each of 24 regular-size muffin cups.
2Make and bake cake mix as directed on box for 24 cupcakes. Cool in pans 10 minutes; remove from pans to cooling rack. Cool completely, about 30 minutes.
3In small bowl, measure 1 cup frosting, and stir in pink food color to desired color. Frost cupcakes with pink frosting. Spoon white frosting into resealable heavy-duty food-storage plastic bag. Cut 1/4 inch off corner of bag. Gently squeeze bag to pipe messages on cupcakes. Store loosely covered.