Appearing on a celebrity special of The Jeremy Kyle Show, the former coke addict cried as she revealed she did the drug before giving birth to her son Kai (now nearly 16) - and just ten minutes after he was born.
The ex-EastEnders star said: "I asked people to leave the delivery room after I'd given birth so I could have a line."
She also admitted to using up to five grams a day during her pregnancy - and said that her son once found her on the floor during a frequent cocaine convulsion.
The 39-year-old said: "I was in a terrible state. My 3-year-old son was trying to put a Mars bar in my mouth, trying to make me come round.
"No-one could help me. I used to do coke off the back of a Disney DVD that my kids watched."
On taking up to five grams a day of coke during her pregnancies, she said: "I could have killed my son and my daughter.
"I tried for years to make it up to them, then I realised I just had to be a mum and love them. The only thing I can do for them is stay sober.
"At one point, I asked social services to take Kai away from me, because I needed help. It took a lot for me.
"I feel ashamed a lot of the time; whatever I do, however well I do, I still feel shame for being a drug addict."
Now clean for 12 years, it was her husband Kevin Jenkins who put her in rehab after she stole from him.
"I was three months pregnant and he just put me on a plane to Arizona, I was so drugged up I didn't know what was happening."
The child star said that it was her circle of friends who got her into the drug at a young age: "I had cocaine before my first drink or cigarette, aged 14.
"I was in a bar where I shouldn't have been and a 17-year-old boy was there. It was full of yuppies and stockbrokers. He rolled up a 50 pound note and told me it wouldn't hurt me. I really liked him so I said yes.
"I'd just done the big 'Just Say No' campaign for Grange Hill. It changed my life from then. I was off drinking, smoking and taking drugs."
Now diagnosed with bi-polar, she said that co-stars Mike Reid, June Brown, Barbara Windsor, Ross Kemp and Steve McFadden often tried to help.
"Ross and Steve sat me down and told me everything would change once I started EastEnders and to be careful, but I didn't listen. And they were right.
"One time I collapsed down the stairs of the Queen Vic on set and Ross had to carry me off to an ambulance. I feel so embarrassed like I let everyone down.
"The worst I've ever been was when I would lock myself in the house for four to five days at a time. With coke, paranoia is so bad I thought everyone knew.
"My psychosis got really bad, I was hallucinating, I could hear voices. I used to have a man who dropped off the drugs through my letter box and I'd sit in the dark for days, watching TV, then I'd order more. I was completely mentally insane."
On the hole in her septum, she said: "It had been like that for seven months. EastEnders used to shoot me from a different camera angle so they couldn't see it."