POPSTAR Harry Styles shows off his toned abs as he cools down in the heatwave.
Sunbathers sizzled on the hottest day of the year at 32.7°C (90.8°F) – the sixth straight day above 30°C (86°F).
Former 1D star Harry jumped into a swimming pond in north London.
One onlooker said: “He kept a low profile and went largely unrecognized. He swam laps and practiced his diving.”
Harry, 29, is currently taking a break in the capital after finishing his worldwide Love On Tour shows.
Harry, who is now dating Canadian actress Taylor Russell, 29, said: “I feel like the people who discovered cold water swimming are so happy for you that you’ve found it too. “
It was hotter in the UK than Ibiza yesterday.
Friends frolicked in the sea in Brighton and Bournemouth while racegoers dressed smartly at Ascot, Berks.
Manchester, the Midlands and Wales were given a yellow thunderstorm warning which ended at 9pm last night.
The mercury will hit 32C (89.6F) again in the Southeast today before the longest September heatwave on record ends.
By midweek, temperatures will drop back to the monthly average of 17°C (62.6°F).
Forecaster Stephen Dixon said: “There is a chance of above average temperatures again by the end of September. It certainly looks likely.”