Kelly Osbourne wrote this on her Twitter page about Nelson Mandela after hearing about his death on Dec. 5, 2013, &#39;Today is officially one of the saddest days! The world has lost the most inspirational person to ever walk the earth rip #NelsonMandela.&#39;  &#40;Pictured: Kelly Osbourne walks the red carpet at the 2013 Oscars on Feb. 24, 2013.&#41; <span class=meta>(OTRC)</span>
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