Kelly broke her silence on her father's death Thursday, telling her followers she "lost the best friend [she's] ever had."

Kelly Osbourne spoke out for the first time since Ozzy Osbourne's death on Thursday, July 24. The rocker and father of six died on Tuesday, July 22, at 76 years old. Kelly shared a poignant line from the Black Sabbath song "Changes,

Just days before Ozzy Osbourne’s passing, Kelly Osbourne — who costarred on the MTV reality series "The Osbournes" with her dad as well as mom Sharon Osbourne, 72, and brother Jack Osbourne, 39, from 2002 to 2005 — addressed online speculation that the heavy metal icon’s health was deteriorating.