Using boxed cake mixes, you will bake four cakes in all: two 8" rounds and two 9x13 rectangular.

Next, frost the five sugar cones.

Once the cones are frosted, sprinkle them with pink sugar sprinkles.

Store cones in the refrigerator until you're ready to assemble the cake.

Before you put your cakes together, you'll need to level them.  I highly recommend an inexpensive cake leveler, just because it's so much easier to use than a serrated knife. Don't worry if the corners are a little uneven, because you'll be cutting them off to add the towers anyway.

Place one 9x13 cake, leveled side down, on a large platter. If you don't have a platter big enough, you can use a cardboard cake board (which was what I did).

Frost the top of the cake with white frosting and place the second 9x13 cake on top, leveled side down again.  Now, frost the entire cake.

Level the round cakes. You may want to use a cardboard round (it makes serving much easier), but you don't have to. Place the first round cake in the center, leveled side down, and then frost the top.

Add the second round cake on top of it, also leveled side down. Now you are ready to frost.  Don't worry if it's not perfect, because you can always go back later and add more frosting.

Cut off a small part of each corner, just large enough to fit the cones.

Cut a hole in the top of the round cake to hold your last tower.  It doesn't matter if you don't cut it to the exact size. Don't forget to ice the inside of the regular cone to hold the pink sugar cone in place. I cut my hole towards the back of the cake so I'd have room for a happy birthday message but you can put it in the middle if you're not adding a message.

Insert a frosted cone in the hole, then add the pink sugar cone.

Now it's time to have some fun decorating! Mix up some pink frosting and pipe it around the base of each of the cakes. You can also use it to decorate the turrets. Add mini marshmallows to the turrets as well, then add your Happy Birthday message.

Originally, I rolled out the fondant and brushed yellow food coloring over the top. If I were to make this again, I would mix the food coloring right into the fondant, then roll it out (but either option works).

Cut four windows and a door from the fondant. Use pink frosting to make the windowpanes and add a small dot of pink to the door to make the doorknob.

Mix up some green frosting and add it to a piping bag. Pipe vines on the turrets and around the windows, then add candy flowers.

Add vines and flowers around the front door.

To add the finishing touch, place shredded coconut in a freezer bag, along with a few drops of green food coloring. Seal the bag and shake until the coconut is evenly covered. Sprinkle the "grass" around the edges of the cake, add your princess figurines and enjoy!