The Duke and Duchess of Cambridge could have been thinking about having children as early as their wedding day, it emerged.
The couple decided to save the top tier of their magnificent eight-tiered wedding cake - a tradition usually undertaken by couples who plan to serve the cake at the christening of their first born.
Ms Cairns said: 'As is tradition, the Duke and Duchess have kept the top two tiers. The third tier was cut up and served at the wedding together with the extra fruit cake we supplied.'
Miranda Eason, editor of You & Your Wedding magazine, added: 'Saving the top tier to celebrate the birth of the first born is the tradition.
The top three tiers have been recreated, with new cakes made.
A team of eight people worked for five weeks to make the cake, which compromises 17 individual cakes and weighs more than 70 kilograms.
Ms Cairns said that being commissioned to make the cake was 'wonderful but a little bit scary'.
'The Duchess drew up a list from the language of flowers, all of them have meanings of special significance to her.
The bride gave Ms Cairns detailed instructions for her to include 17 different blooms and foliage for their meaning or symbolism including the four flowers of the home nations - English rose, Scottish thistle, Welsh daffodil and Irish shamrock.
because I would gladly follow kate up an impossibly tall ladder