Kelly Osbourne eviscerated Twisted Sister frontman Dee Snider for trashing her late father, Ozzy Osbourne.

Earlier this week, Snider took to X to suggest that the Black Sabbath frontman “always” had someone else — like the band’s bassist Bob Daisley and late Motörhead frontman Lemmy Kilmister — write “all” his songs for him.

Snider cryptically added that Ozzy’s widow, Sharon Osbourne, “doesn’t like to share.”

Kelly took to her Instagram Story Friday to defend the Rock & Roll Hall of Famer’s legacy and contributions to rock music, beginning her written statement, “My father’s legacy as a musician, songwriter, singer and bandleader speaks for itself.”

She continued, “His friends, those who who worked with him, those who love him, and millions of fans around the world that still continue to buy his records know exactly what he meant what he contributed and what he leaves behind. His legacy will live on eternally.”

But the 41-year-old wasn’t done. She returned an hour later to directly address “spectacularly classless” and “irrelevant” Snider, 71, in a scathing takedown.

First, Kelly called out the vocalist for “trying to diminish” Ozzy and his “extraordinary abilities and achievements when he is no longer here to challenge his allegations,” adding that Snider “cannot claim to know the private reality” of her dad’s life “simply by looking in from the outside or from hearsay from a delusional man [Daisley, with whom Ozzy had a falling out] with a vendetta against my father.”

She then took the opportunity to make a “devastating” comparison between Ozzy’s lengthy career and that of Snider.

“Snider had a brief period of mainstream success more than 40 years ago. My fathers [sic] career spanned nearly six decades — from helping define heavy metal with Black Sabbath to building an extraordinary solo career,” she penned. “His music will continue influencing generations long after all of us are gone.”

Kelly went on to wonder whether Snider’s “attempt to belittle” Ozzy was a way to get “people talking about him again” since “the music industry moved on from Snider’s commercial peak decades ago.”

By contrast, she argued that her father’s “name, catalogue and influence still remains globally relevant.”

Moreover, Kelly insisted that the Grammy winner “doesn’t need Dee Snider’s approval to establish his place in music history” and slammed the singer for “trying to make” Ozzy “smaller” to make himself feel “bigger.”

“It only reminds everyone of the enormous difference between their legacies and further proves just how irrelevant Snider is to the music industry and society as a whole,” she concluded her brutal upload. “However I would like to thank you Dee Snider for allowing the world to see how truly desperate he really is!”

Reps for Snider, Kelly and Sharon did not immediately respond to Page Six’s requests for comment.

Ozzy died in July 2025 at the age of 76 after suffering a heart attack.