TV host Kirsty Gallacher romped with comic Jack Whitehall at a star- studded party.
Kirsty, 42, and Jack, 29, went into a room alone after a steamy clinch in front of fellow celeb guests.
He later told pals Freddie Flintoff and Jamie Redknapp of his romp with the Sky Sports host, dubbed Thirsty Kirsty for drink-driving last year.
The pair, who have known each other for years, began the evening at a showbiz event.
A source revealed: “The chemistry between them was brewing all night. They had the hots for each other.
“They later went to the Groucho Club in London’s West End, then to a party at a flat, taking some friends with them.
“When they got there, they ramped things up and weren’t trying to hide it.
“They were kissing and being very touchy-feely before heading off for some privacy. Everybody there knew what was going on.
“Jack’s always had a thing for Kirsty and thinks she’s hot.
“Given that they are both single, they went for it. Who knows if anything serious will develop? But it’s fun for the moment.”
Love Island host Caroline Flack, radio DJ Matt Richardson and Kirsty’s Sky Sports colleague Sarah-Jane Mee were also at the private party, plus a number of industry pals.
Mum-of-two Kirsty guested on Jack’s Sky 1 show A League Of Their Own in 2014 and 2016. The second time she was on with fellow guest Nick Grimshaw as well as regular host James Corden.
Two months ago Jack revealed he was quitting the panel quiz after six years to focus on acting and his YouTube video series Training Days.
He stars in upcoming Disney film Jungle Cruise with Dwayne Johnson and Emily Blunt.
He has been single since a 2017 split from actress Gemma Chan, 35. He was recently linked with Brit pop princess Dua Lipa, 22.
Kirsty has been single since her 2014 divorce from ex-rugby ace Paul Sampson, 40.
She got a two-year road ban and 100 hours’ community work after being caught more than three times the drink-drive limit in Eton, Berks, last August.
Both Kirsty and Jack declined to comment.