KRISTIN'S FEARS FOR HER KIDS

It was a mother's nightmare. On Oct. 17, Kristin Cavallari's ex-husband, Jay Cutler, was arrested in Tennessee for driving under the influence with two firearms including a loaded pistol - in his vehicle (he was released on $5,000 bond).

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She shares custody with the NFL vet, 41, of their kids, Camden, 12, Jaxon, 10, and 8-year-old Saylor, who were not with their father at the time. "The fact that he was arrested with a loaded firearm in the car is disturbing to her," an insider tells Star