Decades after his rise to heavy metal fame, the self-styled Prince of Darkness, his wife Sharon and their two then-teenage children Kelly and Jack starred in MTV's The Osbournes, pioneering what the show's producers describe as a "reality sitcom".

Kelly Osbourne is mourning the death of her dad and rock legend Ozzy. On Thursday, the musician and daughter of the Black Sabbath frontman returned to social media for the first time, using the opening line to “Changes.” “I feel unhappy,” she wrote. “I am so sad. I lost the best friend I ever had.”