Sharon Osbourne has revealed she is terrified of dying of Alzheimer's like her father.
The former X Factor judge lost her 81-year-old dad Don Arden in 2007, following his battle with the debilitating form of dementia, and is worried she will suffer from it herself after testing positive for two of the four genes responsible.
Sharon told the Daily Mirror she and husband Ozzy - who have three children - both had the tests done at a university in England, explaining: "They test every single cell, chromosome and gene in your body; it's like a DNA test but a million times more sophisticated.
"The results showed I have two of the four genes that give it to you. They're not the two major genes, but they're still there and I have them."
The 62-year-old TV presenter and music manager, who has battled cancer in the past, went on: "I was terrified because my dad died from Alzheimer's.
"It is the most soul-destroying disease. To see someone you love come down with it... it's wicked, it really is.
"There is nothing I can do to prevent it, nothing. People say to take cod liver oil and do puzzles and things, but then I look at people diagnosed with dementia.
"My father was super-active mentally, and take Margaret Thatcher, Ronald Reagan... they were all so active, and that's what really frightens me."