Kate Middleton has come a long way from just being ‘Princess-in-Waiting’ to the Duchess of Cmabridge.
And now it turns out that the recently married Prince Harry has a secret pet name for his sister-in-law as well, and it is surprisingly formal.
Born Catherine Elizabeth Middleton, the Duchess of Cambridge typically goes by "Kate".
But according to OK! magazine, Prince Harry instead prefers to call his sister-in-law "Cath" as a marker of their close relationship.
The newly-married Prince is rumoured to prefer "Cath" because this is what Kate Middleton used to go by when they were first introduced in 2001.
And considering Harry and Kate's closeness, we can imagine Harry quite likes being the only one to call her "Cath.” However, this is not the only nickname she goes by.
Prince William is said to call his wife "babe" and "darling". And during her school career, Kate also went by "Squeak" which was also the name of her guinea pig.