Decorate cupcakes. Use brush to brush piping gel on envelope icing decoration. Sprinkle with pink hearts edible accents.
Prepare buttercream icing following recipe directions. Tint light pink.
Use spatula and pink icing to ice cupcakes smooth. Insert envelope icing decoration in center of cupcake; use icing for support if necessary. Sprinkle additional pink hearts edible accents on cupcakes.