Kelly Osbourne calls her father Ozzy's death "the hardest moment of my life" in an emotional Aug. 4 Instagram Stories post days after his funeral in Birmingham, England. The Black Sabbath frontman died on July 22 at 76.

Kelly Osbourne admits she’s not doing well and struggling with grief following the death of her rockstar father, Ozzy Osbourne. “I’ve sat down to write this a hundred times and still don’t know if the words will ever feel like enough… but from the bottom of my heart, thank you,” she wrote in a statement posted to her Instagram Story Monday.