Many people have used the pandemic's stay-at-home order to get healthy and fit, and that goes for celebs too. Even A-list stars have used the downtime to drastically change the way they look, shocking fans with their extreme weight loss.

RELATED: Fans Are Dying To Know Jessica Simpson's Exercise Routine After 100 Pound Weight Loss

Actress Rebel Wilson has been keeping fans updated with her weight loss journey by posting several photos on her Instagram, while Ayesha Curry revealed her weight loss transformation by posting a bikini photo on social media that had fans stunned. These celebrities and more have used this uncertain time to focus on their health and the results are nothing short of amazing.

10 Tiffany Haddish

Actress Tiffany Haddish used her quarantine downtime to lose major weight. The 41-year-old star shared before-and-after photos on her Instagram of her weight loss progress after admitting that she quit smoking and was beginning a fitness program. So far, Haddish has lost 50 pounds.

RELATED: 10 Celebrity Couples Who Broke Up During Quarantine

In an Instagram Live, she shared with her followers, "I feel like if I would have done this 10 years ago, it would have been a lot easier," she shared, adding, "I'm stronger than I thought I was. I definitely have more endurance than I thought I have."

9 Marissa Jaret Winokur

Hairspray star Marissa Jaret Winokur wowed her social media followers when she debuted a new look while taking her absentee ballot to the mail this past November. According to People, the actress revealed she dropped 50 pounds during quarantine because she was afraid that she would get a severe case of the virus.

While the virus is known to be more severe in people over 60 with lung or heart disease, Winokur was taking no chances since she had cervical cancer at the age of 27 and has asthma. At the time she shared, "Truth [is] COVID scares me. I checked off all the boxes, I am HIGH RISK!

8 Kelly Osbourne

Kelly Osbourne stunned fans when she uploaded a photo of herself looking a lot slimmer after struggling with her weight for quite some time. The television personality revealed that she had lost a whopping 85 pounds during the summer of last year, keeping a promise that she had made to herself before the year began that she would focus on her health.

RELATED: Zendaya Explains Why She Has To Take Social Media Breaks For Mental Health

"2020 is going to be the year of me," she shared on Instagram, adding, "It's time to put myself first, stop taking on other people's sh-- and be the badass sober woman I was born to be."

7 Steve Kazee

Shameless actor Steve Kazee knew he had to make life changes for his fiance Jenna Dewan and their newborn baby when he hit the scales at 227 pounds. The actor took to Instagram to tell his followers that he had lost 18 pounds and would continue living a more healthier lifestyle.

"Having my son has really put the focus on being the healthiest version of myself for now and for the future. For the first time, I have made wholesale changes to my life. Gone are processed foods and sugars, unhealthy fats and carbs, and blood sugar spiking desserts," the actor shared.

6 Ayesha Curry

Ayesha Curry made jaws drop when she revealed her impressive new figure after losing 35 pounds last year. The wife of Golden State Warriors basketball player Stephen Curry took to her social media to share her amazing weight loss transformation, posing in a green bikini and showing off her toned figure.

RELATED: Selena Gomez & Other Celebs Who Do Cooking Shows/Tutorials

Speaking about her weight loss, Curry shared that it was time that she put more focus on herself. "I spent my entire 20s having babies. Now it's my turn to nurse myself," the author said.

5 Rebel Wilson

By far, actress Rebel Wilson has had one of the most impressive weight loss journeys. The star admitted that 2020 was going to be her "Year of Health" and she committed to losing weight.

Wilson has already reached her goal weight of 165 pounds, which she has been documenting on Instagram, uploading photos of herself going on hikes and in her workout outfits. Even though she has hit her goal weight, it looks like the Pitch Perfect star is continuing to live a more healthy lifestyle.

4 Katie Maloney

Vanderpump Rules star Katie Maloney admitted that after making some changes to her eating habits, she has lost "a little over 20 pounds," according to Us Weekly. After discovering that her glucose levels were high, she had a better understanding of what foods to eat and what to avoid."

"I'm not dieting," Maloney admitted, adding, "But I just have a wealth of knowledge on what kind of food to be eating."

3 Peter Facinelli

Twilight actor Peter Facinelli used his quarantine downtime to focus on himself and that helped him to get more healthy and toned. The star shared, "Overall wellness has become increasingly more of a focus for me - especially given the pandemic."

He also shared with Us Weekly, "I chose to meditate more, make better eating choices, and work out harder. I become more invested in my health."

2 Adrienne Bailon

The Real co-host Adrienne Bailon also took the past year to focus on her wellness and revealed that she had lost 20 pounds. The star took to her Instagram to reveal her weight loss while wearing a bikini in July 2020.

Talking about her amazing weight loss, Bailon shared, "During this time more than ever...Staying healthy is at the top of my mind! This is my first post in a bathing suit since losing 20lbs."

1 Emily Simpson

The Real Housewives of Orange County star Emily Simpson showed off her new figure on Instagram in August 2020 after admitting that she had lost 16 pounds. The reality star used her downtime to change her diet and took up a fitness routine.

"It's been a JOURNEY to get to this point right here," Simpson shared on Instagram, adding, "Ups and downs. Gains and losses. Currently 16 pounds down. Body fat percentage 10 percent lower than last year. And no longer categorized as 'obese.'"

NEXT: Matt Damon Says This Is "The Most Physically Challenging" Thing He's Ever Done