Some of the most well-known celebrities in the world become unrecognizable after slimming down. Here's a look at some of the most dramatic celebrity weight loss transformations.

Melissa McCarthy

Melissa McCarthy has always been open about her weight loss journey. In 2013, she opened up to Us Weekly about her fluctuating weight, saying at the time "I've been every size in the world." She has even fallen victim to fad diets, revealed to People Magazine (via Women's Health) during her stint on "Gilmore Girls," that she lost 70 pounds four months by doing an all-liquid diet.  "I'd never do that again.

I felt starved and crazy half the time," she said. at the time. Then in 2015, McCarthy dropped 50 pounds by changing her mindset. "I truly stopped worrying about it," she told Life & Style at the time. "I think there's something to kinda loosening up and not being so nervous and rigid about it that, bizarrely, has worked."

Ree Drummond

Ree Drummond looked completely transformed after dropping 38 pounds. The Food Network star detailed her weight loss story on TikTok from January to May 2021. "No gimmicks at all. I just cut calories, exercised more, lifted a lot of weights," she said at the time.

The "Pioneer Woman" star showed off her svelte frame and declared, "I look better but I feel so much better, and that's what really counts."

Bronson Pinchot

"Perfect Strangers" star Bronson Pinchot lost at least 60 pounds while under lockdown during the pandemic. The sitcom star exclusively told Page Six that his weight loss journey began in May 2020 when he glimpsed a photo of himself from the 2017 reboot of "Battle of the Network Stars" and was horrified. Six months later Pinchot had shed 60 pounds. He says that that the first thing he did was clear his kitchen of junk food and replenish it with loads of healthy fruits and vegetables.

"The First Wives Club" star, who is now vegan, says he now fits into clothes that he wore when he was 26 years old.

Adele

Adele first appeared to be losing weight back in October 2019 when she was photographed at Drake's birthday party. After, the paparazzi captured the "Send My Love" singer showing off her new figure while hanging out on the beach and taking a walk. The 32-year-old star seemed to be keeping a low profile, but then took to Instagram to show off her new figure in a Christmas Instagram post and flaunted even more progress with a pic on her birthday in May 2020.

Adele's celebrity friends went crazy for her new look, which she reportedly maintains with the Sirtfood diet and help from a personal trainer. Her weight loss came on the heels of her divorce from Simon Konecki in September 2019.

Jessica Simpson

Jessica Simpson had a massive mommy makeover after giving birth to daughter Birdie May. The 39-year-old singer revealed on Instagram she had lost 100 pounds in just six months after she and husband Eric Johnson welcomed their third child together. She shared that she was "so proud to feel" like herself again. Simpson credits her long-time trainer for helping her shed the pounds in such a short amount of time.