United Kingdom, July 25 -- Kelly Osbourne has lost her "best friend" following the death of her dad Ozzy Osbourne.

The 40-year-old star has taken to social media to share her thoughts following Ozzy's passing on Tuesday (22.07.25), aged 76.

Kelly - who released a cover of the Black Sabbath song Changes with her dad back in 2003 - wrote on Instagram: "I feel unhappy I am so sad. I lost the best friend I ever had. (sic)"

Ozzy performed his last-ever concert at Villa Park in Birmingham earlier this month, and Kelly actually got engaged backstage to Sid Wilson, from the band Slipknot, at the star-studded event.

The Back to the Beginning concert also featured appearances from the likes of Metallica, Yungblud and Guns N' Roses.

Ozzy's deat...