Humiliated Jemima Khan dished out a torrent of four-lettered abuse to boyfriend Hugh Grant at a posh Elton John bash, claims The Mirror.
The cause of her anger? Only his ex Liz Hurley flirting outrageously by seductively sucking his finger in front of dozens of A-list celebrities - according to the paper.
Jemima saw red - actually, change that for crimson - at Elton John's White Tie & Tiara dinner at his mansion in posh Windsor, Berks last week.
Guests looked on open-mouthed as Liz - who Hugh dated for most of the 1990s before he was caught with a hooker - performed her saucy show on him.
The paper says her hubby-to-be, Arun Nayer, was just yards away oblivious.
Not so Jemima. She was clearly disgusted and stormed off using the F-word several times as bumbling Hugh ran after her.
One guest said: "Jemima was furious. We couldn't believe it when she (Liz) grabbed Hugh's hand and started sucking it suggestively.
"Even if it was just a laugh you could see how uncomfortable Hugh was.
"Everyone was stunned by Liz's behaviour."
Jemima, who Hugh has been dating for a year, was clearly not in a forgiving mood and told him to f*** off three times, according to witnesses.
One added: "He must have had a hell of a lot of crawling to do."
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