Made in Chelsea star Alex Mytton, Binky Felstead's on-again/off-again boyfriend, collapsed at the Secret Garden Party festival.
He was partying with fellow MIC cast members Spencer Matthews and Jamie Laing when the incident happened.
Onlookers were said to have described the star having a 'seizure-like' episode.
A spokesperson for the star told a newspaper: “Alex was taken ill at Secret Garden Party this weekend due to heat exhaustion and dehydration. He was treated in the medical tent and was soon able to rejoin the event.”
