Jack Osbourne, the son of metal icon Ozzy Osbourne and America's Got Talent judge Sharon Osbourne, has revealed that he has been diagnosed with multiple sclerosis in the new issue of People. Multiple sclerosis is an autoimmune disease that damages the central nervous system, affecting muscle control, vision, balance, thought and feeling.

Osbourne, who became famous in his own right while appearing with the rest of his family on MTV's reality show The Osbournes, learned of his condition two weeks after fiancé Lisa Stelly gave birth to their daughter, Pearl. "I was just angry and frustrated and kept thinking, 'Why now?'" he told People. "I've got a family and that's what's supposed to be the most important thing."