An adorable video of Prince William playing with his daughter has revealed the very cute, but very fancy nickname he has for Princess Charlotte.
The future King spent about an hour playing in the Back To Nature garden at Chelsea Flower Show, which was created by Kate Middleton.
The Mirror reports William can be heard calling his daughter a very cute - and very fancy - nickname.
When calling Charlotte over to push him on the swing, he refers to her as 'Mignonette'.
The French word means "small, sweet, and delicate" or "cute". Older French definitions also show it can mean gentle and kind.
Kate and William also have an adorable for George - Tips.
The name apparently started at PG - for Prince George - and they then started comparing it to the teabags. In the end, the dropped the PG bit.
We don't know if they have a little name for Louis yet, but we wouldn't be surprised if they do as the Royal Family loves a nickname.
Kate reportedly calls her hubby "baldy", while he refers to her as DoD which is short for Duchess of Dolittle - ouch!
When he was studying at the University of St Andrews, Wills called himself "Steve" in a bid to blend in with fellow students.
But the Queen has some of the best nicknames in the family.
It turns out the royal gang have a really cute name for the head of the family - Mama.
However new additions to the family, like Kate and Meghan, weren't allowed to use the nickname until they've got to know her a little bit.
The younger royals, including Prince George and Princess Charlotte reportedly call her Gan-Gan . How cute!
But the Queen's husband Philip has her own names for the Queen, and some of them are just bizarre.
Apparently the main nickname he uses for the love of his life is Lilibet, but he also occasionally calls her Sausage.
