GOSSELIN WAR EXPLODES!

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JON & KATE GOSSELIN‘s fragile peace shattered as new back-biting breaks out!

RadarOnline.com reports the hair trigger for the new blow-up was when Kate trekked to Mexico – and left the kids alone with a teenage babysitter!

 "Jon was furious that she allowed somebody he didn’t even know look after their kids," revealed an insider.

"To make matters worse the children were not allowed to see their father during the trips and the sitter was instructed not to talk with Jon either."

At the center of the conflagration was Kassondra Morgan, 19, the kids’ live-in sitter.

While Kate was  flitting about glamorous hot spots, Kassi, was trying to cope with the reality show brood.

"Kassi was basically being put in the middle of Jon and Kate and that was way too much pressure for her," the insider divulged.

"Kassi was totally miserable and would call up her friends crying before she finally plucked-up enough courage to quit the job and return to her parents."

Get more @RadarOnline.com