Jonah Hill
From lifestyle changes like extreme dieting to going under the knife, we expose 50 shocking celebrity weight losses that are sure to drop your jaw! Who made our list, how much weight did they lose and did they gain it back? Let’s take a look at these celebs and their journey from fat to fit!
Healthier eating and cutting alcohol were major changes that helped Jonah look the way he does now. Looking good!
Kim Kardashian
Kim Kardashian did not always have a big butt, which people seem to love her for.
When she was pregnant with Kanye’s children, she put on a good amount of weight, but she quickly lost the baby weight and went back to looking stunning, as did a lot of these celebrities.
Adele
Adele in 2013...and now.
Chris Pratt
Chris has been shredding on and off due to his roles on film.
Nicole Richie
Nicole was known as a rich, wild party girl. What changed?
Now, she is married, a mother of two and a fashion guru fully engulfed in a healthy lifestyle.
Kelly Osbourne
Kelly has gone through some serious changes over these recent years.
Now a fashion designer and actress, Kelly lost about 70 pounds and feels better than ever.
Christian Bale
Bale dropped from 180 pounds to about 120 pounds. Then he bulked back up to 220 pounds.
Why He Did It: To portray an anorexic, insomniac factory worker in The Machinist, then he got strong again to be Batman in The Dark Knight
Chris Hemsworth
Chris Hemsworth didn’t alway have the “Thor” physique but once he was able to pack of 30 pounds of muscle it was presumed that he needed to play the character for the next two parts: Avengers and Thor: The Dark World.
He was not out of shape before, in fact he was more of the cut up lean figure, but how does someone go from skinny guy to the cape wearing hammer throwing muscle bound superhero?
50 Cent
As The Huffington Post reported, rapper 50 Cent decided to undo his permanent ink choice a few years back because he wanted to be an actor.
"It cuts down on the amount of time I have to spend in makeup covering them up," 50 Cent said about his decision, as quoted by the source.
People magazine reported that his then-upcoming roles in "Twelve" and "Things Fall Apart" spurred the ultimate choice to rid himself of some of his arm tatts.
Still, he has no plans of removing his giant back piece.
Rosie O'Donnell
O’Donnell no longer wants her weight to be an issue.
After a vertical gastric sleeve surgery, she has now lost over 64 pounds in two years.
Zach Galifianakis
Almost unrecognizable with the weight loss and the shave. Zach Galifianakis said the biggest change was drinking.
“Booze, I was done with it.
I couldn’t wake up , so I stopped. I’m lucky that I could just stop, but boy I miss it.”
Nicole "Snooki" Polizzi
After having her first child, she has become thinner than ever. “Even though I want to be healthy for myself and it feels great to be healthy, I mainly want to do it for my kids,” Polizzi said. “I just really want to be a fit mom.
I want to be able to keep up with them, run after them.”
She works out daily for 45-minutes or an hour every day when her crazy schedule allows her. She is also loading up on pre-packaged meals with lean protein and vegetables.
Perez Hilton
Perez, the well-known blogger and media star admitted that his weight has been an issue his whole life. He decided to make a change in 2008 and kept it. ” Like so many people, I have struggled with my weight throughout my entire life. Thankfully though, at the beginning of 2008, I made a commitment to my health and I have stuck to it. Nearly four years later and I am in the best shape of my life!
I’ve lost more than 70 pounds and I’ve worked for it. I’ve done it the old-fashioned way, slow and steady, by eating healthily and exercising regularly. And I feel wonderful!”
He works out seven days a week, does pilates, and yoga. he also gives his readers access to the team that helped him lose weight on his website.
Renee Zellweger
Amazing what plastic surgery can do to your face. “I’m glad folks think I look different!
I’m living a different, happy, more fulfilling life, and I’m thrilled that perhaps it shows.”
Renee Zellweger is happy with the changes and doesn’t mind what other people think of her.
Wendy Williams
Wendy Williams, who had her own daytime tv show, has looked a lot thinner recently.
She admitted she had lost over 50 lbs by going to the gym.
Jennifer Hudson
Jennifer decided to watch what she eats and lose the weight. She is now a Weight Watchers spokesperson.
She has lost about 80 pounds and is keeping a strict diet.
Christina Aguilera
Christina's weight has been fluctuating a lot in recent years. Fans were initially surprised when she gained a lot of weight the first time. Christina lost about 45 pounds and looks amazing.
She works out and keeps a clean diet.
Sam Smith
Sam Smith dedicated time and energy working out religiously and the results paid off for the talented British singer.
Josh Peck
You may know Josh from the Nickelodeon series Drake & Josh. After the show ended, Josh decided to focus on being healthy.
He now is taking care of himself by adopting a healthier lifestyle and working out a lot.
Khloe Kardashian
We have always seen Khloe on the heavier side; but, now she changed her look drastically. The reality star confirmed that she lost about 30 pounds due to exercise and dieting.
She likes to switch up her workouts.
Janet Jackson
A few years ago, Janet has been seen overweight. The singer credited NutriSystem for helping her lose the weight she gained.
She still gets to eat the food that she loves and works out a lot.
Jack Osbourne
The Osbournes are known for their dramatic changes. “I think having issues with weight is clearly a universal problem these days. We weren’t designed to sit in cars and sit behind desks for 9 to 15 hours a day.
We have two legs, we’re natural hunter-gatherers, and we’re meant to be on our feet all day. So it’s something a lot of people have to battle in some aspects. As far as getting advice from each other, it’s not like we sit around like, ‘You know what you really need to do, Kelly?’ It never really comes up.”
Jessica Simpson
Jessica's pregnancy was a major part in her gaining weight. She gained her figure back by using Weight Watchers and taking the Factor Five Diet.
She looks better than ever.
Missy Elliot
In 2002, the singer mentioned that she had to change her way of eating. Doctors warned her that she had to lose weight. She is on a low-carb diet and her Grave's disease is now under control.
We are going to see many great things from her. 
Drew Carey
Drew Carey lost 100 pounds before he started hosting The Price Is Right. “I’m eating better, taking better care of myself. When I was doing , I was eating a lot of garbage, I was drinking a lot, so I had a lot of mood swings.
I had diabetes.”
Drew Carey cut out a lot of alcohol which he admits was part of his success. He started reading self-help books like 'Your Erroneous Zones' by Wayne Dyer.
Jordin Sparks
Jordin lost 50 pounds in only a yeah and a half. “The key was finding exercises I enjoyed.
If you don’t, you won’t stick with it.” Jordan Sparks was eating healthier meals and simply cutting back on some of the foods that she knew was bad for her. She also got in touch with a personal trainer who would help her find the workouts that could help her the most.
Jason Segel
“I’ve just been living healthy, exercising, eating right — no more midnight pizzas.” Jason Segel wanted to make sure that when he took his shirt off, it wouldn’t be funny anymore.
Peter Jackson
After being tired of being overweight and unfit, he started a personal diet and exercise regimen.
He lost 44 pounds while he was filming 'The Adventures of Tintin' in 2010.
Mariah Carey
After dumping Nick Cannon she gained a few pounds.
But now that she is with James Packer, she has transformed her body to get the confidence boost she needed.
Timbaland
Hard work pays off from Timbaland. “This past eight months I’ve lost over 130 pounds. With a positive mindset I knew I had to take the initiative to make myself happy and healthy. When you realize that the only thing that is getting in the way of your goal is self doubt you’ll want to push yourself harder. You got to do this for you.
This is for you. This isn’t about anybody. Live for you. Honor you. Never lose sight of that.”
Britney Spears
After mental breakdown, Britney is in a good place. Who could forget when Britney Spears shaved off all her hair? The drama with the paparazzi?
After finally getting her life back in order she’s probably one of the happiest pop stars around.
Randy Jackson
Randy Jackson lost 100 pounds. Randy Jackson has had a history of obesity.
With Type 2 Diabetes he wanted to get his life in order.
“The problem is that those diets don’t work for people who have the disease of obesity.”
He underwent gastric bypass surgery and got into fitness to turn his life around.
Star Jones
Nine years after a gastric bypass surgery and she’s made dramatic changes. “I thought I’d gain the weight back.
I had never been successful at losing weight before. I needed to forgive myself for being such a smart girl and so stupid when it came to something like my health.” She went from a size 26 to a 6 after she improved her diet and started exercising regularly.
Tom Arnold
For most of his career, Tom has been seen more on the heavier side.
Tom now works out several times a week and is taking care if himself so he can be around a long time for his son.
Aretha Franklin
Singing legend, Aretha Franklin, was big, to say the least… and we mean REALLY big.
But in recent years, Aretha has done something we never thought she would… she lost weight!
Ricky Gervais
Gervais made a decision with his girlfriend to help each other lose weight. Ricky made minor changes in the way he eats.
He said he lost 40 pounds simply by eating less at night.