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Kelly Osbourne isn't backing down to social media trolls commenting on her appearance since her dad died. She's got 3 words for them ... "go f*** yourself."

The British singer and actress delivered the apropos message in a now-deleted Instagram story. She outed some of her followers for writing things like, "Are you ill?" or "Get off Ozempic" or "You don't look right" in response to her appearance. Getty

But Kelly has been in the public eye since she was a teenager, and she says it's unfair for people online -- some of whom she says are "grown-ass women" who "look like they have weight struggles of their own" -- to compare her 41-year-old body to the one she had at 18.

She said, "People's faces change when you grow older."

Not to mention, she's still reeling

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