Oscar-winning actress Nicole Kidman has undergone medical testing for a bone-debilitating disease osteoporosis, report British tabloid The Sun . The disease is said to usually affect women over 50, however, the 35-year-old Kidman, who has suffered from hectic work and malnutrition, may also be prone to this illness.

"Over-worried, overworked and underfed, that's Nicole. She's been frantically working on one project after another," a source has told US National Inquirer.

The disease is said to cause bones to become fragile and susceptible to breakage. The Stepford Wife Kidman has broken two ribs while shooting Moulin Rouge, and has recently lost a lot of weight.