“I feel unhappy I am so sad. I lost the best friend I ever had,” wrote Kelly Osbourne alongside a broken heart emoji over a black background.

Heavy metal rocker Ozzy Osbourne died this week at 76, just weeks after his farewell show and about five years after announcing he had Parkinson's disease.

"What Ozzy establishes in the '70s is this idea that Ozzy is so cool and such a central point of this big band, Black Sabbath...that whatever he chooses as a fashion statement onstage, essentially be...