The 25-year-old recently sat down with TV presenter Piers Morgan for an episode of his Life Stories chat show, where she revealed the extent of her past drug problem.
She said: 'At the start I only took one every weekend. Then it was one every weekday, then two a day, then three. By the end I was taking so many pills I was on my hands and knees vomiting blood because the drug was ripping away my stomach lining.
'I was taking 50 a day, more than twice the lethal dosage, and every day I took one more, hoping I wouldn't wake up.
'If I hadn't gone into rehab then, I'm sure I wouldn't be here now. I feel very lucky because people die every day from taking painkillers like Vicodin, and I was taking much more than them.'