He once described her as the "sister he never had" and despite all the tension of the past few years, Prince Harry and Duchess Catherine's mutual admiration for one another was put on full display at Prince Philip's funeral on Saturday April 18.
The in-laws had a brief yet sweet encounter shortly after the church service at St George's Chapel, Windsor Castle.
Footage capturing the moment shows Prince Harry and Kate Middleton walking side-by-side sharing a friendly chat together before Prince William joins the pair.
In the past, Prince Harry has spoken of his special bond with his sister-in-law.
"To have a big sister is very, very nice... She's a fantastic girl, she really is, my brother is very lucky," the father-of-one once revealed of the Duchess.
Watch the touching moment between Kate Middleton and Prince Harry below
But he also insisted that while he and older brother Prince William no doubt have their differences, he hopes they will one day regain their strong bond.
The two brothers put their differences aside over the weekend as they paid tribute to their late grandfather.
Harry and William did not walk shoulder to shoulder in the procession, but were separated by cousin Peter Phillips, Princess Anne's son, as they walked in a line behind their grandfather's coffin.
Both were dressed in suits and black ties after the Queen decided no family member would wear uniform.