Kelly Osbourne is mourning the loss of her father Ozzy following his death on Tuesday. Osbourne posted a brief message to her Instagram stories on Thursday afternoon. “I feel unhappy I am so sad,” she wrote. “I lost the best friend I ever had.”

On July 22, Kelly Osbourne, along with mom Sharon Osbourne, siblings Jack Osbourne and Aimee Osbourne, as well as half-sibling Louis Osbourne, from the singer's previous marriage to Thelma Riley, released a statement confirming the Black Sabbath lead singer's death.

Ozzy Osbourne was also remembered as 'Papa' in emotional tribute from Jack Osbourne's ex-wife Lisa Stelly, who shared that 'the world got Ozzy' but his family got a loving grandfather.