Kelly Osbourne has scathing message to critics of weight loss as she opens up about struggle to eat since Ozzy's death

Being the daughter of a famous rock star and public figure was never easy on Kelly Osbourne, but dealing with the death of her father and Black Sabbath icon Ozzy seems to have been a whole new struggle for the reality TV star.

Voices on social media have been quick to mock her rapid weight loss in the five months since Ozzy's death in July, making unfair jabs about her appearance and making inferences about the 41-year-old using drugs like Ozempic to aid weight loss.

The death of Ozzy, aka the bat-eating 'Prince of Darkness', was met with sadness around the world at the loss of the pioneering heavy metal singer, prompting a widespread period of mourning and funeral procession through his home city of Birmingham, UK.

But obviously, this heartbreak was felt nowhere more strongly than in the Osbourne clan, many of whom were present as the 76-year-old took to the stage with Black Sabbath for the last-ever time, just 17 days before his death from a heart attack.

Despite her grief, Kelly had a simple and scathing message for her haters on social media, with a post on Instagram beginning: "To the people who keep thinking they're being funny and mean by writing comments like 'Are you ill,' or 'Get off Ozempic, you don't look right.'"

Kelly Osbourne had a defiant message for her haters (Instagram/@kellyosbourne)

She then explained her rapid change in appearance, saying: "My dad just died, and I'm doing the best that I can, and the only thing I have to live for right now is my family. And I choose to share my content with you and share the happy side of my life not the miserable side of my life.

"So to all those people, 'f--- off.'''

Kelly, Sharon and Ozzy's second child, has since deleted the video explaining why she had experience such a striking weight loss, but her mom has separately commented on the video in an emotional interview with Piers Morgan.

Sharon, who breaks down multiple times in the interview with Ozzy's memory still fresh in her mind, praised her daughter's scathing response to people commenting on her physical appearance.

She added tearfully: "She's lost her daddy, she can't eat right now."

Kelly has been forced to live with continuous public comments about her weight since she starred on her parents foul-mouthed reality TV show The Osbournes aged 15.

Often, this attribute has been ridiculed and leered at even while she was struggling with much deeper problems.

The Osbournes have had a difficult year (Leon Neal/Getty Images)

In a May interview with People, she explained: “I have been a drug addict, an alcoholic … I’ve been a complete mess, disrespectful to people, horrible.

"But I got more s--- for being fat than I did for anything else. It’s insane," she told attendees.

Separately, Kelly has spoken about how comforting the public were in the wake of her father's death, a stark contrast from the mean-spirited comments she has received recently.

She said: "I never could have even imagined it to be as helpful as it has been to know that we're not alone in our grief, in our sadness and that the rest of the world loved him as much as we did.

"I haven't seen an outpouring like that since Princess Diana died. I didn't expect it."