KATIE Price insisted on taking weekly drug tests to "prove" she was clean – but suddenly stopped before her car crash.
In March she told The Sun she was taking regular tests to put her family at ease, after her constant partying and her breakdown last year.
However, the reality star was thrown off track when she signed up to tour the country with her make-up classes.
A source said: "Katie went off on holiday and then she went on tour with the make-up masterclasses and the tests didn't happen.
"Then everything seemed to go off the rails – all of her friends and family are devastated as she was doing so well."
Katie, 43, first turned to drink and drugs last year after an avalanche of personal problems spiralled.
Her mum Amy is terminally ill with a lung disease, disabled son Harvey, 18, had been battling health problems and she found herself in a bitter court battle with cheating third husband Kieran Hayler as well as being declared bankrupt – despite amassing a £45m fortune.
Katie is mum to Junior, 16, and Princess, 13, who she shares with Peter Andre, as well as Jett, 7, and Bunny, 6, with ex husband Kieran and Harveywith Dwight Yorke.
Katie said at the time: "My kids thought I had lost the plot and was partying.
"They didn’t realise it was me breaking down trying to block things out – they needed to know the truth.
"All the kids say that I am so much better now. But they say, ‘mum if you ever get back to how you were, we are never going to speak to you again’.
"I tell them they never have to worry because I wouldn’t go back there.”
Confirming she was clean and off drugs, she said: "I haven’t drank and I definitely wouldn’t do the coke again.
"I will do drug tests again so nobody can ever accuse me of anything again too."
Yesterday, she pleaded guilty to three charges of drink-driving, driving while disqualified and driving without insurance.
Katie overturned her vehicle at 6.20am on Tuesday near West Grinstead, close to her home in Horsham, West Sussex.
Her roadside alcohol reading was nearly double the legal limit and she tested positive for cocaine.
The ex-model and reality star was said in court to have told police who pulled her from the wreckage: "I took drugs, I should not be driving, I admit it all."
The star left court with a blanket over her head alongside her father Paul Price, who then drove her away in a blue Fiat 500.
The Sun can reveal Katie jumped intoxicated behind the wheel on Tuesday after a bust-up with her boyfriend Carl.
A source said: "Katie and Carl had a massive row and things escalated. She's been under a lot of pressure over the past few weeks and it seems she just snapped. Katie went off the grid for eight hours as friends tried to track her down.
"It seems during that time she turned to booze and drugs."
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