The christening takes place later of Princess Charlotte - the latest addition to Britain's Royal Family.
The 2 month-old daughter of the Duke and Duchess of Cambridge, Will and Kate, will be christened in a private ceremony in the same church where her grandmother, Princess Diana, was baptised.
It'll be the first time the family, including their first son Prince George, has been seen together since she was born.
Royal photographer, Ian Lloyd, says he's expecting a fairly informal affair:
