Royal wedding cake heads to auction The Duke and Duchess of Cambridge's royal wedding cake is photographed before it goes on display a...

Royal wedding cake heads to auction

The Duke and Duchess of Cambridge's royal wedding cake is photographed before it goes on display at Buckingham Palace during the annual summer opening on July 20, 2011 in London, England. The cake was featured in the wedding of Catherine, Duchess of Cambridge to Prince William, Duke of Cambridge on April 29. (Photo by Lewis Whyld/WPA Pool/ Getty Images)

The team led by Fiona Cairns (not in picture) that made the Royal wedding cake, put on the finishing touches for Prince William and Kate Middleton, in the Picture Gallery of Buckingham Palace in central London on Friday April 29, 2011. (AP Photo/John Stillwell, Pool)

Fiona Cairns poses for a photograph with the wedding cake she and her team made for Prince William and his wife Catherine, the Duchess of Cambridge, in the Picture Gallery inside Buckingham Palace in London April 29, 2011. REUTERS/John Stillwell/Pool

A detail of Prince William and his wife Catherine, the Duchess of Cambridge's eight tiered wedding cake, made by Fiona Cairns and her team, is photographed in the Picture Gallery inside Buckingham Palace in London April 29, 2011. REUTERS/John Stillwell/Pool

A detail of Prince William and his wife Catherine, the Duchess of Cambridge's eight tiered wedding cake, made by Fiona Cairns and her team, is photographed in the Picture Gallery inside Buckingham Palace in London April 29, 2011. REUTERS/John Stillwell/Pool

The eight tiered wedding cake made by Fiona Cairns and her team, awaits the newlyweds, Prince William and Kate Middleton, in the Picture Gallery of Buckingham Palace in central London, on Friday April 29, 2011. (AP Photo/John Stillwell, Pool)

The first cut made by the Duke and Duchess of Cambridge in the royal wedding cake is photographed before it goes on display at Buckingham Palace during the annual summer opening on July 20, 2011 in London, England. The cake was featured in the wedding of Catherine, Duchess of Cambridge to Prince William, Duke of Cambridge on April 29. (Photo by Lewis Whyld/WPA Pool/ Getty Images)

A slice of cake from the wedding of Prince William and Kate Middleton hits the auction block on May 3. The cake, which was designed by Fiona Cairns, will come in a special memento box with a starting bid of £100 (approximately $165).