Kate herself once set aside protocol when greeting Federer. Back in 2017, following his record-breaking eighth Wimbledon title win, the Princess greeted him with not one but three kisses on the cheek—a nod to Switzerland’s traditional greeting customs.

That moment, too, was widely viewed as a gesture of warmth rather than a formal misstep.

Their friendly rapport was once again on display this year, when Federer returned to the Royal Box at Wimbledon alongside his wife, Mirka. Just two rows behind them sat Kate’s parents, Carole and Michael Middleton, further underscoring the deeply personal connection between the families.

While much of Wimbledon remains governed by strict dress codes and formal traditions—especially within the Royal Box—it’s these quiet, unscripted moments of familiarity that often leave the most lasting impression.

And in this case, a rule gently bent between longtime friends only added to the charm of Centre Court.