14 Celebrity Weight-Loss Transformations That’ll Make Your Jaw Drop

Kelly Clarkson The beloved singer's weight has fluctuated since she won American Idol, but she's gotten into kickboxing. That's her on the left in 2015 before getting pregnant with her second child, and on the right in October 2016.

Melissa McCarthy The hilarious actress has reportedly lost a whopping 75 pounds since 2014, all thanks to a new workout regimen and diet. via Getty Images

Adele The singer has lost quite a bit of weight since 2013. She credits eating healthier as well as quitting smoking to her slimmer physique. via Getty Images

Gabourey Sidibe The "Precious" actress secretly underwent weight loss surgery back in 2016 after being diagnosed with Type 2 diabetes. Months after the procedure, she continues to lose weight. "I have a goal right now, and I’m almost there," she said. "And then once I’ve got it, I’ll set another. But my starting weight and my goal weight, they’re personal. If too many people are involved, I’ll shut down." via Getty Images; Instagram

Jessica Simpson Her weight has gone up and down over the years, but since having two nearly back-to-back pregnancies, she's shed the pounds through Weight Watchers. via Getty Images

Miranda Lambert The country star has lost 20 pounds since 2013, significant considering her tiny frame. via Getty Images

Shonda Rhimes The TV producer has lost more than 100 pounds since 2012. She credits eating much less food and smaller portions of food to her success. via Getty Images

Mariah Carey The diva is known for her fluctuating weight. But since 2013, it's estimated that she's lost about 45 pounds, thanks to a personal chef. via Getty Images

Jennifer Hudson Since 2008, the singer has lost more than 80 pounds and has kept the weight off by watching what she eats and by being active. via Getty Images

Kirstie Alley The actress has had ups and downs in her weight loss journey, but since 2010, she's lost a solid 50 pounds thanks to Jenny Craig. via Getty Images

Mo'Nique The comedian has shed 80 pounds since 2008, and she has her family to thank for motivating her to try different exercises, including hula-hooping. via Getty Images

Sara Rue Sara Rue has lost 50 pounds since 2009 thanks to Jenny Craig. And she's kept it off! via Getty Images

America Ferrera The actress has remained mostly tight-lipped about losing weight, but it's clear since 2005, there has been a major difference. via Getty Images

Sharon Osbourne Since 1987, the star has had weight loss surgery and has gone on the Atkins diet to get to where she is today. What a difference! via Getty Images