Kelly Osbourne: Former Addict Reveals Her Biggest Regret

As documented on her family's hilarious reality TV show "The Osbournes," Kelly Osbourne used to be a quite the wild child. The daughter of Black Sabbath rocker Ozzy Osbourne and TV personality Sharon Osbourne battled an addiction to pain killers and alcohol for over five years of her young life until she entered rehab for treatment in 2009 and got sober.  Three years later, at 27, The singer-turned-TV presenter has opened up to CNN's Anderson Cooper about her regret and guilt over the nightmare she put her parents through during her addiction.

"I did a lot of really, really stupid things and it was because it was my way of crying for help," Kelly revealed. "Not just drugs ... Going out and staying out all night, and being disrespectful to my mother, which to me is one of my biggest resentments because I love my mum; my mum's my best friend. I hate the fact that I hurt her and my father," she admitted.

Kelly went on to reveal that her now-sober famous father, who has a staggering 40 years of drug and alcohol abuse under his own belt, blamed himself for his daughter's troubles. "My father, to a certain extent -- now not so much, but at the time -- blamed himself and that killed me."

After feeling the pain she caused her own parents, Osbourne offered up some advice for other parents whose kids are struggling with addiction. "With my mother she didn't wanna believe it, she didn't wanna accept that I wasn't perfect because you love your children, but unfortunately nothing's perfect and as much as it hurts you you have to do the best thing, and you have to send your child to rehab," she advised.

"It is the only way to fix things, to teach you the skills and the coping mechanisms that you need to have a normal life and get your life back again. But having said that, it takes you to do it."