Kelly Osbourne's rehab reason

Kelly Osbourne checked herself into rehab after threatening to break a fan's finger.At the height of her addiction to "downers" - including Valium and Vicodin - the singer admits she suffered from dangerous mood swings.Kelly eventually realised she needed help after scaring herself with her own rage.Shetold Britain's Glamour magazine: "This girl came up to me and shouted, 'That's Kelly Osbourne!' and pointed a finger in my face - literally her fake nail touched my nose and I just flipped."I grabbed her hand and said, 'Don't f**k with me, or I'm going to break your f**king finger off."The 21-year-old star is not the first Osbourne to suffer from addiction. Her famous father, Ozzy, is notorious for his drug-fuelled antics, while brother Jack - a recovering alcoholic - was the first of the siblings to be admitted to rehab.