About 100 lucky winners will get to rub shoulders with royals and heads of state at the historic service at Westminster Abbey in London.
They will also be invited to raise a toast to the future king and his queen at the lavish reception, expected to be held at Buckingham Palace.
The exact method of picking which lucky members of the public are to join the Royal shindig has still to be worked out. But it will be completely at random.
More here.