Kim, 30, and Kris Humphries, 26, who are set to marry on August 20, visited Hansen's Cakes on July 29 to sample some of Los Angeles' best cakes.
The couple decided on a ten-tier white cake with chocolate-chip icing and black-and-white decorations.
However, a source told UsMagazine.com that: 'Kim wants it to resemble Prince William and Duchess Kate's!'
When the Duke and Duchess of Cambridge tied the knot on April 29, they had a traditional multitiered fruitcake with cream and white piping designed by British baker Fiona Cairns.