Kidman has tests for bone disease

Oscar-winning actress Nicole Kidman has reportedly undergone a bone density test to check whether she has the debilitating disease osteoporosis.

Although the disease usually affects women who are 20 years older than 35- year-old Kidman, insiders believe a lack of nutritional food and the Cold Mountain star's hectic work schedule have contributed to her possible condition.

A source tells American magazine the National Inquirer: "Over-worried, overworked and underfed, that's Nicole. She's been frantically working on one project after another."

Women who have the bone disease become much more fragile and susceptible to breaking limbs.