KIM and Kourtney Kardashian are secretly at war amid fights over their kids and their sister Khloe.
The Sun can reveal they've been bickering off-camera after viewers saw them slam each other on their reality show The Kardashians.
It comes as Kourtney was seen getting upset on the Hulu show saying Kim "wasn't happy" at her wedding last year – and has removed herself from their family WhatsApp group.
But sources tell The Sun that there tension over much more than the event held in Italy.
They said: "Kim and Kourtney used to be so close but now there isn't one day they're not fighting.
"Kourt tells Kim she's fake and 'exhausting' and Kim and Khloe joke Kourtney can't make a decision without Travis."
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The source added: "Kourt's always accusing Khloe of hanging out with Kim over her – and there's also tension over the kids.
"They had a big blow-up recently as Kim thinks she was really involved with Kourt's kids when they were younger, but Kourt hardly sees her children aside from at big family events.
"Then that boiled over into a fight about how it's impossible to arrange playdates. The issue is they know each other's trigger points and what to say to hurt each other's feelings. Everyone is worried."
The Sun has contacted Kim's rep for comment.
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Kourtney, 44, and Kim's, 42, long-standing rivalry has been growing in recent years, and Kourtney is no longer trying to hide it on their reality show.
She even revealed she avoids her younger sister because relations are so fraught.
In a snippet from this week's episode, Kourtney added that it bothers her when Kim's life "bumps into" her own.
Kourtney has also previously accused Kim of using her wedding as a "business opportunity."
According to Kourt, Kim never asked permission to borrow the theme from her wedding to use for her collaboration with Dolce & Gabbana.
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