A slice of the wedding cake Prince William and Catherine, Duchess of Cambridge tucked into at their lavish 2011 nuptials is expected to fetch up to $2,000 (£1,250) when it goes up for auction next month (Dec14).

The fruit cake was enjoyed by guests including Queen Elizabeth Ii, former soccer star David Beckham and his wife Victoria, and wedding singer Ellie Goulding three years ago, and now one lucky royal devotee has been given the chance to own a piece.

The slice, sealed in a special presentation tin, is estimated to fetch between $1,000 (£625) and $2,000 (£1,250) at the Julien's Auctions of Beverly Hills sale in December (14).

The wedding cake won't be the only royal lot for sale - a number of ball gowns belonging to William's late mother, Diana, Princess of Wales, are also up for auction.

The dresses, the latest from Diana's wardrobe to be sold off, include a petal pink design by Catherine Walker, which the princess wore to an opera in London in 1993, and a Zandra Rhodes evening gown Diana donned for a benefit in the U.K. capital in 1987. The items are expected to sell for at least $60,000 (£37,500) and $80,000 (£50,000), respectively.

The lots are currently on display in New York and will be auctioned off in Beverly Hills, California on 5 and 6 December (14).