The Prince and Princess of Wales played a significant role on the first day of the state visit, but there were moments when Prince William and Kate let their guard down.
After welcoming France's President Emmanuel Macron and First Lady Brigitte Macron at RAF Northolt, the couples travelled to Windsor, where the King and Queen were waiting to greet their guests.
As Charles and Camilla exchanged pleasantries with the Macrons on the royal dais, William and Kate were seen exchanging big smiles, with the Princess even wrapping her arm around her husband at one point.
The couple, who celebrated their 14th wedding anniversary in April, have been more affectionate in public in recent months, with William releasing his most personal message to date on his wife's 43rd birthday back in January.
He wrote: "To the most incredible wife and mother. The strength you've shown over the last year has been remarkable. George, Charlotte, Louis and I are so proud of you. Happy Birthday, Catherine. We love you. W."
Kate has been making a gradual return to her public duties since completing her cancer treatment last autumn, confirming she is in remission from the disease at the start of the year.
See the Prince and Princess' most affectionate moments.