As well as both being very, very posh, the Duchess of Cambridge and Jack Whitehall have another thing in common - their school.
They both attended the private boarding school Marlborough College, but Kate was a few years older than the comedian.
Jack brought up their shared education at the Royal Variety Performance in 2014, but he also used the occasion to reveal an "inappropriate" secret.
As Jack took to the stage to huge cheers from the crowd, he explained how he knows Kate.
He said: "I'm very excited to be here. I'm especially excited to be here performing in front of the Duchess of Cambridge.
"This is genuinely true, this is so exciting.
"We were actually at school together. This is true. We were at the same school.
"I was a bit younger than you, but this is the first time I've seen you since school, so hello."
Kate can be seen laughing in her seat and gives him a small wave.
Rather than stopping there, he goes on to embarrass Kate, earning himself a stern look from William.
He said: "I don't whether it's appropriate given the circumstances, but you were probably my first ever crush.
"Okay, definitely inappropriate. Your Highness is giving me a very sharp look."
But Jack didn't get away with his flirting, and William had something to say about it after the show.
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Recalling their chat during a chat with Jonathan Ross, Jack said: "William came over and he was very funny, he was very nice but very passive aggressive [and said] 'Oh, so you were flirting with my missus? Oh no that was very funny!'"
He also explained that he never stood a chance with Kate when they were at school, adding: "She was a lot older than me.