The eldest sister of Peaches Geldof has been battling with clinical depression for two decades - keeping it a secret from her rock star father.
Fifi Geldof, 31, said she was first diagnosed with the mental illness at the age of 11, following the break-up of her parents, Boomtown Rats frontman Bob Geldof and television presenter Paula Yates.
"I never expressly told my parents. Dad doesn't know. I wouldn't talk to him about it now. I don't have that relationship with my family," she said.
Speaking to The Mail On Sunday, Fifi described how she took drugs, drank heavily and began comfort eating following her mother's death, having previously being treated for clinical depression.
Her mother died from a heroin overdose at her London home in September 2000, while sister Peaches died of a heroin overdose in April this year after losing her battle against addiction to the Class A drug.