French President Emmanuel Macron appeared to mock Boris Johnson's long hair as the leaders were buffeted by wind while watching the RAF flypast.
The Prime Minister and Mr Macron, who is visiting the UK to mark the 80th anniversary of the Charles de Gaulle's Appel broadcasr, observed the flypast of the Red Arrows and their French equivalent, La Patrouille de France at the House Guards Parade on Thursday.
But just as they were saying goodbye, the French President appeared to mock Mr Johnson's long blonde locks.
As the pair struggled with blustery conditions, Mr Macron could be seen laughing and point at his own head as Mr Johnson's hair was scraped backwards by the wind.
During the spectacle, Mr Johnson and Mr Macron maintained social distancing, standing a few metres apart.
Beforehand, a group of protesters congregated behind the police barriers on Horse Guards Road, chanting and shouting while a line of officers moved towards them.
The two leaders clapped following the flyover and waved before giving each other a thumbs up.
Mr Johnson earlier welcomed Mr Macron to Downing Street, where the two leaders held bilateral talks.
The French leader is visiting London to mark the 80th anniversary of General Charles de Gaulle’s famous Second World War broadcast.
Inside No 10, Mr Macron and Mr Johnson looked at artefacts documenting General de Gaulle’s time in London and his partnership with Sir Winston Churchill.
