Princess Kate joined her husband Prince William, King Charles III and Queen Camilla on Tuesday as they kicked off France's state visit to the U.K. The royals gathered at RAF Northolt in Windsor, England, to welcome French President Emmanuel Macron and his wife Brigitte at the start of their three-day state visit.

When France’s President Emmanuel Macron greeted Kate Middleton on July 8, he politely kissed her on the hand. While gentlemanly, was this a break in royal protocol? In short, no—although the gesture is a rare one for the Princess of Wales to experience when meeting diplomats.

William and Kate met President Emmanuel Macron and his wife Brigitte at RAF Northolt at 11 a.m. The two couples traveled to Windsor where the King and Queen greeted them on a dais before taking them on a carriage procession through Windsor town to the Castle.