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Cairns, 56, has been making cakes for 25 years. She cannot disclose how much she, or her staff is getting paid for this royal job.
Here's what we do know about the cake, from Caims' interview with The Telegraph:
The cake weighs more than a sumo wrestler (and seems significantly larger than the groom's cake). There are 17 different types of flowers. It is a rich fruitcake and each guest will be able to get a small slice. The colors will be white and cream and there will be no pillars. The cake will be transported in a van, but don't worry, there is a Plan B in case something goes wrong.
Sounds like it could be the most substantial food item the guests eat all day.
What else can we be sure of? The cake certainly won't look like any of these bizarre iterations.