The 28-year-old star is grateful for Sharon's determination to help her get clean as an unruly teenager, reported Aceshowbiz.
"I've been to rehab seven times and to two mental institutions. My mum even had me put in a padded cell once to scare me, but like a brat I just sat it out until she said, 'Well, that's not going to work'," Kelly said.
The 'Fashion Police' star admitted she tried to clean up her act aged 18 when Sharon was diagnosed with cancer, and put her career on hold and look after her mother.
However, it took a few more years before the style-savvy star, who is engaged to chef Matthew Mosshart - stopped dabbling in drugs.
"I was never one of those people who was like, 'Let's party; let's go and do loads of coke'. In fact, I would never even tell anyone I had drugs because I wanted them all to myself. I was quite selfish.