I have a lot of scrapbooking supplies, so this craft was pretty easy to create.
First I punched some 1 1/2" stars using card stock in rainbow colours (red, yellow, green, blue). Then I punched some 1 1/4" stars in white card stock. I free hand wrote the number 3 (the birthday girl's age), in coordinating colours on the white stars.
Next I used a glue stick to stick all the numbered stars to the colourful stars.
These were simple and fun to make and were a festive addition to the cupcakes.