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Real Housewives of Beverly Hills star Brandi Glanville is claiming her oldest son with Eddie Cibrian, Mason, 9, got "extremely ill" from eating his stepmother LeAnn Rimes' laxatives.

"Mason, my eldest, ate some of Le's candies and got extremely ill. And Le's candies are laxatives. It was a big f--king deal for me, and I lost my mind," Brandi, 40, tells Us Weekly in a new interview. "She has one in every purse. Mason found [it] on the floor and thought it was a Skittle! They don't keep sugar in the house. He thought he finally found candy."

Pics: LeAnn Defends Herself with Teeny Weeny Bikini Photos

Brandi adds, "I, unfortunately, don't find her to be stable and I don't want her around my kids when Eddie's not there -- or at least the nanny, his parents, someone."

However, LeAnn's rep denies the incident. "Just more inaccuracies and half-truths," he tells the magazine.

Related: LeAnn Rimes Enters Treatment Facility

In addition, Cibrian himself has released a statement calling LeAnn "a loving and positive influence" on his two sons with Brandi, Mason and Jake, 5.

"They are without a doubt lucky to have her. The love they have for their 'bonus mom' continues to grow each day as we navigate the changes to our family; a fact that Brandi cannot argue as she herself has stated as much," Cibrian says. "It is absolutely ridiculous that my ex-wife continues to put the personal lives of myself, LeAnn, our sons and my family on public display for the sake of her notoriety. She is fully capable and has the means of contacting myself and LeAnn privately to discuss any matter concerning the children. The fact she chooses not to, should be pretty transparent. And while I do not wish to fuel her ever-igniting fire, there is a breaking point where enough is enough."

LeAnn, 30, whose weight has been the subject of constant scrutiny, underwent a 30-day treatment program for stress and anxiety in late August. She has repeatedly denied having an eating disorder.

Related: Brandi Glanville says tabloid coverage actually helped her when Eddie Cibrian dumped her for LeAnn Rimes