Prince William and Kate Middleton are serving seven-year old treat as Prince Louis’s christening cake at the party, proving the royal family’s commitment to both tradition—and recycling.

Guests will be served slices of christening cake, which is a tier taken from The Duke and Duchess of Cambridge’s wedding cake.” Though the cake is still edible after all these years because of ...

one of the eight tiers from the wedding cake of the Duke and Duchess of Cambridge has been held in reserve, and is going to be served at a private tea at Clarence House following the christening.