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Prince Harry Has a Surprising Nickname for Kate Middleton (and Its Totally Adorbs)
Alaistair Grant/Getty Images

We already know that Kate Middleton and Prince Harry are unexpected besties. But what we didn't know is that Harry actually has a totally sweet nickname for his sister-in-law that he uses on a variety of chill (and decidedly un-royal) occasions, according to an interview Kate did last year with BBC Radio 1.

The name? Cath. Short for Catherine, which is actually Kate's full—more formal—name. For her part, Kate (or should we say Cath?) isn't quite sure how the shortened moniker bestowed on her by Harry came to be. Instead, she admitted that when it comes to Harry, "I'll answer to most things." LOL.

Just one more reason why Kate and Harry's relationship = #inlawgoals.

RELATED: A Look Back at Prince Harry's Role as the Royal Third Wheel

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