Speaking on ITV’s This Morning, Park said the controversial operation left her “swollen from head to toe,” adding it “wasn’t worth it”.
Her warning comes just days after the death of 29-year-old mum of three Leah Cambridge after the botched operation.
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The controversial procedure involves taking fat from the waist or stomach and inserting it in the buttocks and is popular with a host of reality TV stars.
But Park, who won £1 million on the EuroMillions at the age of 17, suffered a severe allergic reaction to the anaesthetic, leaving her face and lips badly swollen.
She told hosts Eamonn Holmes and Ruth Langsford: “I thought I was going to die. I didn’t know what was wrong with me and they said I’d had a reaction to the local anaesthetic”
“When I woke up I was very cold and sore and I was told I would come round in a bit and when I did I got up to go to the toilet and looked at myself in the mirror, I was just swollen from head to toe.”
“It was horrible and the aftercare wasn’t good at all. I was crying and in pain. I was just told “you’ve paid for having this done”.’
Park said she became obsessed with the operation after seeing celebrities from The Only Way is Essex had undergone the same procedure.
The operation takes between one and two hours and involves a tiny cannula being inserted into a 2mm hole to extract fat.
The fat is then purified and re-injected into the buttocks.
She said: “For a couple of months I looked at clinics and I researched the celebrities who had it done and they said it was fine and all good.”
“It just seemed like an easier way to lose weight.”
But asked if she would do it again, she said: “‘Don’t do it. People need to fully research it.”
“Message someone who’s had it done to find out their experience. If I knew what was going to happen, I would have never have done it.”