The Owl And The Pussycat...

...went to sea
In a beautiful pea green boat,
They took some honey, and plenty of money,
Wrapped up in a five pound note.
The Owl looked up to the stars above,
And sang to a small guitar,
'O lovely Pussy! O Pussy my love,
What a beautiful Pussy you are,
You are,
You are!
What a beautiful Pussy you are!'

I doubt the girls had Edward Lear in mind when they went hat shopping, but this is what Princess picked!