Kelly Osbourne's Complete Weight-Loss Transformation

Being a nepo baby comes with plenty of privileges, but it has its downsides, too. Kelly Osbourne, daughter of the late rock legend Ozzy Osbourne, knows all too well that growing up in the public eye can be a particularly traumatizing experience when your body doesn't fit society's idea of beautiful. "I was called fat and ugly in the press almost my entire life," Osbourne told Shape in 2011 (via International Business Times). "I understand that being judged by others comes with the territory, but it broke my heart and ruined my self-esteem. It sets you up to hate yourself in a huge way. ... I truly believe it's the main reason I turned to Vicodin and ended up in rehab three times. I just hated myself."

Body shaming can take a serious toll on a person's mental health, and in Kelly's case, toxic diet culture harmed her body image before her brain was even fully developed. "When I was a kid, I got pulled into the head of the [TV] agency's office and [the executive] was putting golf balls into a cup and gave me a whole speech about how I was too fat for TV and I needed to lose weight, and that if I lost weight, I would look better," she revealed on "The Osbournes Podcast" in 2024. "And he was just saying, 'You're not a movie star, but you could be one if you lost weight.'" Comments like this haunted her for years before prompting her to take several measures to change her body. She explored dieting, exercise programs, medication, and even weight-loss surgery, but ultimately, she learned that no external change is worth it until you heal your mindset toward your health and self-esteem. 

Body shaming is hard enough to handle from a loved one, but after years of it from the media and those in the industry, Kelly Osbourne decided to change her diet in 2009 at the age of 25, just as she embarked on a new career chapter with her stint on "Dancing with the Stars." Before the show, she was eating for emotional reasons and making unhealthy choices as a substitute for addiction, including centering her diet around pizza and French fries without doing much exercise. "I replaced the drugs with food and just got fatter and fatter," she shared with Shape in 2011 (via the Los Angeles Times). "When I get upset, my diet goes out the window." As part of a commitment to eating healthier, she would typically start the day with cereal or a veggie omelet, then have high-protein foods like turkey burgers paired with more veggies for lunch and more protein at dinner time. She'd also have one day a week where she'd eat her favorite foods.

While appearing on the cover of Shape, she admitted, "To be called fat and ugly your whole entire life by everybody in the media, or they have to put some kind of title, like cherubic, chubby on every heading of every article written about you, to now be on the cover of Shape Magazine, it's like the best f— you I could have ever had in my life." The "Papa Don't Preach" singer added that lifting weights, sit-ups, and pushups were a part of her weight-loss routine, but she wasn't a fan of squats. "You've gotta be dedicated to what you're doing and you've gotta find a way to make it fun, because if it's not fun, no one wants to do it," she explained, later crediting starting small and getting a gym buddy with helping her stay motivated.

Kelly Osbourne continued the healthy-eating program she'd began in 2009, and was soon well-placed to give advice to others. "I don't think anyone should start a weight loss program without seeing a doctor," she told Cosmopolitan in 2012. "They do a blood test to find out what vitamins you need to take and what you're lacking in. I think this is really important." By 2013, she'd dropped 70 pounds, and one of the biggest tools in her arsenal was an exercise routine that she actually enjoyed.

"I have a Hoopnotica hula hoop," she told Self that year. "I use it every day, and it's made my back and arms stronger, and my waist has gone down 2 inches! On Saturday nights my friends and I put on ridiculous outfits and hula-hoop and dance when everyone else is at 'da club.'" Osbourne also revealed that she was doing around half an hour of cardio every day, which usually took place on the treadmill, along with strength training and yoga. 

As far as her diet went, she told E! News that balance was more important than cutting things out: "For me, what it is about is just finding that healthy moderation, which is easier said than done ... when you're sat there in front of a plate full of French fries, there is no moderation." Her biggest takeaway was to counteract higher-calorie foods, like French fries, with extra time in the gym, but ultimately, she was "focusing more on being content and happy than my personal image." She further weighed in on her change of mindset in an interview with Good Morning America (via E! News), stating, "Becoming healthy doesn't start with a diet, it starts with you mentally. I realized I didn't wanna be the person I was anymore, and the weight loss just kinda came as a plus afterwards."

In 2018, Kelly Osbourne got gastric sleeve surgery, which removes part of the stomach to restrict eating. "I will never ever ever lie about it, ever. It is the best thing I have ever done ..." she gushed on the "Hollywood Raw" podcast in 2020. The "Fashion Police" alum clarified that going to therapy and quitting alcohol were massive elements of her 85-pound weight loss. "The number one thing I had to do was get happy," she confirmed. "I had to fix my head before I could fix my body. You can never go into this if you're not in a good state of mind."

Osbourne also caught up with ET that year during the COVID-19 pandemic, revealing that she had lost another 7 pounds in quarantine. "I've been so healthy every day. I've been taking all my vitamins, juicing, and just trying to stay positive," she said, explaining that she had unintentionally begun intermittent fasting, which can come with legitimate health benefits. "I get up, I have coffee and then I juice until night time and then I have like one meal and then I go to bed. I have so much energy it's crazy. I feel like I'm bouncing off the walls," she added.

Toward the end of 2022, Osbourne gave birth her to her son, Sidney, and like so many women, she felt unnecessary pressure to lose weight again afterward. "It became my mission. I was obsessed with it because I didn't even want to get brought into the conversation, I just wanted to be left alone," she told E! News in 2023, once again citing "moderation" as one of the keys to her weight loss: "It was a lot of work and it was miserable and I was hungry all the time, but I'm really happy with the results.

The Ozempic wave first hit around 2022, and one by one, celebrities started to look different after using the weight-loss medication, which is designed to help those with Type 2 diabetes. In April 2024, having dropped 85 pounds since giving birth, Kelly Osbourne slammed rumors that she had turned to the drug. "I know everybody thinks I took Ozempic. I did not take Ozempic," she told Extra TV. "I don't know where that came from. My mom took Ozempic." She put her weight loss down instead to extreme diet changes after being motivated by health complications. "I had gestational diabetes and I had to lose the weight I had gained during pregnancy otherwise I was at a higher risk of actually getting diabetes which I did not want," she revealed. "I cut out sugar and carbohydrates and I rapidly lost weight."

Shortly after her chat with Extra TV, Osbourne addressed Ozempic again on "The Osbournes Podcast." She said, "... my opinion used to be the same as the people who didn't like my opinion on Ozempic until I met somebody who lost weight from Ozempic and it changed their life. They explained to me how it took the mental obsession with food away and from that reprieve allowed them to dig deeper through therapy and really figure out who they were and how life-changing it was for them ... so I'm like yeah, it's great." The TV personality continued to sing the drug's praises in an E! News interview that year: "I think it's amazing. There are a million ways to lose weight, why not do it through something that's isn't as boring as working out?" Her projection for the future? Ozempic will become more affordable because "it actually works."

Kelly Osbourne's weight-loss journey has seen lots of twists and turns, but the one fact that has always remained clear is how awful the world is to those they deem to be not skinny enough. "We live in a fat-phobic world," she reflected at the 2025 Inaugural Beacher Vitality Happy & Healthy Summit in Los Angeles (via People). "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." Her experiences led her to try everything from surgery to medication to change her body. "I got my mind where I needed it to be, and everything started to fall into place," she shared. "You have to change your brain. You have to come to peace and acceptance about where you are in your life before you can start."

Despite Osbourne opening up about her experience with body-shaming, her social media posts are still flooded with people critiquing her body, ironically now for being too thin. But at least a few fans now understand how harmful the critiques can be and have taken to the comment sections to defend her. "Kelly had gastric band surgery in 2018," one fan wrote under a June 2025 Instagram post. "... Maybe if she hadn't been given so much grief about her weight growing up, it wouldn't be an issue." Another added under the post, "People always talking about her weight. Hateful words when she was at a vulnerable age growing up, now when she is an adult. What she does with her body is [no one's] business." Amen! Now, for another deep dive on the "Project Runway Junior" judge, read up on Kelly Osbourne's stunning hair transformation.

If you or anyone you know needs help with addiction issues, help is available. Visit the Substance Abuse and Mental Health Services Administration website or contact SAMHSA's National Helpline at 1-800-662-HELP (4357).