Kate Middleton has always been a royal family favorite, but it looks like the Duchess of Cambridge has seriously won over her brother-in-law’s love!

Prince Harry already considers Prince William’s lovely wife a part of the family, Us Weekly reports.

"As he puts it, the 'in-law' part isn't necessary when he's describing her. He sees her more like a sister," an insider told the magazine. "He often turns to her for advice — they've always been close."

Harry even third-wheeled it with William and Kate after the Diamond Jubilee concert earlier this month. The trio stayed out partying until 1:30 a.m. and Harry apparently had his sister-in-law in stitches. 

"She loves his sense of humor," the source said. "He makes her crack up all the time, even when it's not appropriate.”

Source: Us Weekly

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