Katherine Jackson reported missing

Katherine Jackson has been reported missing to the Los Angeles County Sheriff's Department after her grandchildren, Paris,Prince, and Blanket were unable to reach her all week, RadarOnline.com has confirmed.

"I can confirm that a missing person's report was filed this evening by Mrs. Katherine Jackson's nephew, Trent Jackson, after he was unable to see her or reach her for a week. The report will be referred to the Homicide/Missing Persons Unit, and they will be handling the investigation," Lt. Josh Thaitold RadarOnline.com exclusively.

And a source close to the situation tells us exclusively, "The kids are being taken care of by their nanny. Paris is absolutely beside herself with worry. She lost her father three years ago, and not to know if her grandmother is ok is just more than she can bear."

Katherine Jackson was blindsided by news a letter had been written by several of her children to the executors of Michael's estate, demanding their resignation. The letter, allegedly from Janet, Rebie,Tito, Randy, and Jermaine, demanded that executors John Branca and John McClain resign immediately because they (the Jackson siblings) believe that the late singer's will was a fake.

This comes after three failed legal challenges in the matter already. The letter also alleged that Katherine Jackson was in bad health and had recently suffered a mini-stroke. Katherine's lawyer told CNN she is in good health and did not suffer a mini-stroke.

Katherine's attorney Sandra Ribera told  CNN that Katherine left her Calabasas, California, home on July 15, to fly to Albuquerque, New Mexico to attend a Jackson Brothers concert two days later.

Her grandchildren, who have lived with her since Michael's death, have been trying to reach her ever since.

"The kids were trying to get a hold of their grandmother and they haven't been able to reach her for almost a week," Ribera told CNN. "They are told she's unavailable. I'm concerned that she's not safe."

Katherine's lawyer went on to reveal that she has never gone 24 hours without talking to the children.