Peaches Geldof died after taking heroin, an inquest heard today.
The use of heroin 'likely contributed' to her death.
The mum-of-two died earlier this month and her autopsy results were inconclusive.
Toxicology tests can take weeks to process and the results were publicly revealed today.
Her inquest began at 2pm in Kent today.
Police found no evidence of drug paraphernalia in the home.
On April 7th, her husband Thomas Cohen entered their home in Kent thinking his wife may have been sleeping, the inquest heard.
He found her at the end of a bed in the spare bedroom of their home.
At 7:45am on Sunday, Peaches had a phone conversation with a friend and was the last known contact before her death.
Police found no evidence of drug use in their home.
On Saturday, she remained at home and was in contact with friends.
A toxicology test confirmed use of heroin - was "likely" to have contributed to her death.
Her family were not present at the inquest.
Last night, the Geldof family would not comment on the reports.
"I cannot confirm anything as an inquest is taking place. The family have no statement," a spokesperson for the Geldofs said.
In the initial stages of the investigation into her death, police said her death was not being treated as suspicious, but rather, unexplained.
The TV presenter and daughter of Boomtown Rat Bob Geldof was found dead while caring for her 11-month-old son at the family home last month.
A post-mortem carried out by a Home Office Pathologist days after she died proved inconclusive, and samples of her blood and tissue were sent off to a laboratory to be tested.
Peaches had a history of using drugs, but had more recently presented the image of a contented mother to her young children, Astala and Phaedra.
She became a passionate advocate of "attachment parenting", including sharing beds with her children, and appeared to have turned a corner following her wild-child youth.
However, the long shadow cast by the death of her mother Paula Yates always remained in the background.
Ms Yates's funeral was held at Mary Magdalene & St Lawrence in Davington, Kent, the same church as Peaches' wedding and funeral.
Following his daughter's tragic death, her father Sir Bob Geldof released a touching statement detailing just how devastated her family were. He referred to his daughter as the "wildest, funniest, cleverest, wittiest and the most bonkers" of all the family.
Peaches lost her mother Paula Yates to a heroin overdose at just 11 years old.
While Peaches' previous wild ways were well documented, many had thought these days were behind her.
“I did experiment with drugs, I did get drunk and go to parties, but I was never that wild," she told Elle magazine.
"I could have been; I could have let myself spiral but all the time I remembered what happened to my mum.”