A slice of wedding cake from Kate Middleton and Prince William's royal wedding is up for grabs in an online auction.

The auctioneer said he is expecting between $1,300 and $1,600 for the slice that was served to wedding guests on April 29, 2011. The cake slice comes in a presentation tin and includes a printed note from Prince Charles and the Duchess of Cornwall, and the 16-page Order of Service, which includes the vows, hymns, prayers and blessing from the wedding.

It's believed to be the first piece of the Duke and Duchess of Cambridge's wedding cake to appear at auction.

The auction ends May 24.

And if that's not enough cake for you, a slice from the 1981 wedding of Prince Charles and Princess Diana is also up for bid. That lot includes a piece of cake from the 1973 wedding of Princess Anne and Capt. Mark Phillips. That auction also ends May 24.