I want this cake for Sav's bday! Directions from www.coolest-birthday-cakes.com This Hello Kitty birthday cake was made using 14" Wilton cake pans. Various star tips and buttercream icing were used to decorate the side of the cake. The Hello Kitty face was outlined with a large round tip and filled with a star shaped tip. Quite easy to make and decorate. The birthday girl adored it.