The arrival of one new princess this year is special enough - but now we get two!
As well as Kate Middleton, a new Mr Men character has been created called Little Miss Princess.
The man who writes the Mr Men books was inspired to think her up by this year's royal wedding.
Two stories have been written about Little Miss Princess, and both books will be out before the big day on 29 April.
The first is called Little Miss Princess and is out on 7 March.
Little Miss Princess and the Very Special Wedding will be out just in time for the big day
The second, Little Miss Princess and the Very Special Wedding, will be available in April.
Both are about the "kind-hearted" new character - in one story she needs to get to a wedding on time (we wonder whose that could be!).
Although she won't be seen by as many people as the big wedding of Prince William and Kate Middleton - Little Miss Princess still promises to be popular.
More than 100 million copies of the Mr Men books have sold around the world!