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The cake will be covered with buttercream and decorated with fresh flowers.

Kensington Palace said the couple asked Ms Ptak to create a cake incorporating “the bright flavours of spring”  and that the soon-to-be married couple are very much looking forward to sharing with their guests at their reception.

Ms Markle who used to run her own lifestyle website thetig.com, had previously interviewed Ms Ptak for her blog.

California-raised Ms Ptak  before opening her organic bakery worked as a pastry chef for chef Alice Waters at Chez Panisse in Berkeley, California and started her own business as a stall in Broadway Market, east London.