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K-Middy and Prince William share countless adorable moments on the regular, but over the years, the Duchess of Cambridge has developed a royally close relationship with her brother-in-law Prince Harry. From their giggle fits and inside jokes shared at official Buckingham Palace events to their mutual love for Game of Thrones, here, eight examples that prove Kate Middleton and Prince Harry are unexpected besties.

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When Harry Cracked a Funny

When the royal family steps out onto the Buckingham Palace balcony, you can bet Her Majesty the Queen expects them to be on their best behavior. But even at the most dignified of events, Harry can't resist an opportunity to lighten the mood—like when he pretended to be a secret agent with a walkie-talkie at the Trooping the Colour ceremony in 2014. Luckily, he always knows he has a captive audience, just as long as fellow giggler K-Middy is by his side.

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And They Bonded over their Mutual Love of ‘Game of Thrones’

Just like us plebians, they can’t get enough of the world of Westeros. On the weekends, Prince Harry, Prince William and Middleton eat supper and binge-watch box sets of HBO’s Game of Thrones. Totes adorbs.

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When They Got the Giggles at the Queen’s B-day Bash

At the Queen’s 90th birthday celebration in 2016, the royal jokester couldn’t help but crack a few jokes while walking arm in arm with his sis-in-law. We want in on the joke toooo!

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And the Duchess of Cambridge Gave Harry Advice

At the 2017 London Olympic Games, it seems Prince Harry turned to Middleton, rather than his brother, for clarification on the day’s events. Because Prince William probably never would have let him live it down.

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When They Realized They Both Suck at Sports

Unlike Prince William and his mad soccer skills, Prince Harry, admittedly, isn’t as athletically gifted as his older brother. Luckily, he and partner-in-crime K-Middy enjoy bonding over their mutual lack of athleticism. For example, when they played a game of “welly wanging” with children at a meeting of the Charities Forum at BAFTA and looked like amateurs.

RELATED: 8 Times Kate Middleton Killed the Stiletto Game

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And Are Better Off On the Sidelines

In 2017 the royal family attended the London Marathon, but it was the Duchess of Cambridge and Prince Harry who stole the show as the day’s biggest (and most enthusiastic) cheerleaders.

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When They Visited the Set of ‘Harry Potter’

Middleton and Prince Harry visited the Harry Potter Diagon Alley set in 2013 and could barely contain their mutual child-like excitement. Besides, who doesn’t love a good magic wand fight?

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And Exchanged This Adorable Glance

Prince Harry has said that the Duchess of Cambridge is the “big sister he never had.” When they arrived at the opening of England’s Global Academy in 2017, Middleton made sure to give her brother from another mother a quick, reassuring glance. We got this, bro.

RELATED: 8 Times Kate Middleton Channeled Princess Diana’s Epic Style

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