Newly single Kelly Osbourne demonstrated her fighting spirit as she took to the stage to perform with Scissor Sisters at London's Mighty Hoopla festival on Sunday. The event, held at Brockwell Park, saw the 41-year-old looking happy and healthy as she joined the American pop rock band to perform her 2005 track "One Word."
The band was also joined on stage by Sir Ian McKellen and Belinda Carlisle at Europe's largest LGBTQ+ music festival. Kelly looked incredible wearing a blue lamé dress with black platforms, and she wore her blonde locks in a slicked-back style.
It was the first time her three-year-old son Sid had watched her perform, and he was seen dancing backstage. A close friend told the Daily Mail: "She's such a good mum. She looks amazing, and this is such a beautiful opportunity to prove the haters wrong."
The friend added: "She was going through grief with her dad passing away, and people were so awful to her. She just needed time to settle back into her life again. She is looking so good and healthy."
It has been a tough time for Kelly, whose father Ozzy died on July 22, 2025, at the age of 76 following a cardiac arrest. She ended her engagement to Slipknot DJ Sid Wilson in March and was linked to a new partner, Kiinicki, who uses they/them pronouns, also in March.
Kelly had been so grief-stricken by the loss of her beloved father that she struggled to eat and was forced to hit back when trolls criticised her weight loss. Her friend said she had the best time on Sunday: "She really enjoyed herself and had the best time and was excited for the opportunity to be with the LGBTQ+ community, who have been her biggest supporters. And to have her son watch her perform for the first time was really special."
Kelly Osbourne's music career spans two albums: "Shut Up" in 2002 and "Sleeping in the Nothing" in 2005. Her biggest hit was a collaboration with her father, Ozzy, on a cover of Black Sabbath ballad "Changes."
In March, Kelly hit out at "cruel trolls" who "dehumanised" her following her appearance at the Brit Awards in Manchester. Kelly attended the ceremony to collect a posthumous Lifetime Achievement award for her father. Speaking on the backlash, she said: "There is a special kind of cruelty in harming someone who is clearly going through something. Kicking me while I'm down, doubting my pain, spreading my struggles as gossip, and turning your back when I need support and love most. None of it proves strength, it only reveals a profound absence of character. I'm currently going through the hardest time of my life. I should not even have to defend myself. But I won't sit here and allow myself to be dehumanised in such a way."
Kelly had previously hit back at "body-shaming" trolls who criticised her recent weight loss ahead of her Brits appearance, where she stepped out with her mother Sharon. She has since called out online abusers for subjecting her to a torrent of vile comments, including an unsavoury remark about her late father. Taking to Instagram, she shared a screenshot of a distasteful message that read: "Looks like a dead body... she's too thin and fragile... looks like she's going to see her dad soon," followed by laughing emojis. Commenting, she wrote: "Literally can't believe how disgusting some human beings are! No one deserves this sort of abuse!"
Kelly has been forced to repeatedly defend herself over her physical appearance following the sudden death of her father. Over the years, she has been open about her insecurities around weight, dating back to her teen years while starring in the family reality show "The Osbournes." She underwent gastric sleeve surgery in 2018, calling it "the best thing I have ever done," and credited a combination of surgery, strict diet, and high-intensity interval training for shedding 85 pounds. However, pregnancy added another twist; when expecting son Sidney in 2022, Kelly gained around 100 pounds and developed gestational diabetes, later admitting she avoided the spotlight because of it.
A source said: "She has told people that she got skinnier for her kid. She wants to be around for her kid and play and be with her kid for a long time, and now that she lost her dad, she sees that as being even more important. She doesn't want to be the weight she used to be, and she is going to do whatever she needs to do to stay skinny."
Kelly has repeatedly fended off critics who scrutinize her dramatic transformation, most notably denying Ozempic rumours. "I know everybody thinks I took Ozempic. I did not take Ozempic. I don't know where that came from. My mom took Ozempic," she previously told Extra. Those close to Kelly are keeping a watchful eye, with a source telling the Daily Mail that "nobody near her is looking to provide an intervention, but people have noticed and are monitoring it." The source added: "Kelly is definitely not concerned with how she looks and would tell anyone that would bring it up to her to go screw off, but she does get upset over people talking about it. She is very skinny. She has been working on her weight her entire life, and the stress of her dad passing away has been a major struggle to deal with that is taking a toll on her look and health."
