Traditionally the father of the bride is the one who pays for the wedding.
But obviously, things will be a little different in the case of Prince William and Kate Middleton's nuptials.
It's been reported Prince Charles will foot the bill using funds from his personal fortune.
And the Queen may also help out with a donation too.
The state will not have to pay for the reception or wedding breakfast, but may have to meet security costs.
Photo: © Rex