The after-divorce of Sacha Baron Cohen and Isla Fisher is threatening to explode into a ferocious feud, say insiders, after the beauty began posting nasty digs at her very private ex-hubby, RadarOnline.com can reveal.

Sources said the flame-haired Great Gatsby babe got Cohen's dander up when she suggested that the lanky star of the upcoming Mandrake the Magician superhero flick was a pig in a social media post.

"For all the men who say, 'Why buy the cow when you can get the milk for free?' Here's an update for you," she teased. Article continues below advertisement

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