With all the pressure celebrities face to look perfect in front of the cameras, several stars have slimmed down and created some shocking transformations.

For example, Jersey Shore star Snooki was a lot heftier before she gave birth to her son Lorenzo. After the baby was born in August 2012, the reality star hit the gym and shed almost 50 pounds.

"I work out every single day, and at this point, I'm obsessed," she told EnStars at SELF Magazine's Rock The Summer event in New York City in July. "It's like my aphrodisiac."

Christina Aguilera has faced much scrutiny in regards to her weight. In recent years, she put on a couple of pounds and critics bashed her. But, a few months ago, the Voice coach flaunted a slimmer figure.

"I've been through my highs; I've been through my lows. Being too thin, being bigger. I've been criticized for being on both sides of the scale. It's a noise I block out. I love my body. My boyfriend loves my body. My son is healthy and happy, so that's all that matters to me," she told Marie Claire in January 2012.

Jennifer Hudson is one of the most talked about celebrities to lose tons of weight. After being named Weight Watchers' celebrity spokesperson in 2010, the former American Idol contestant shed over 80 pounds.

"When it happens and you achieve it, people somehow try to find a way to try to discredit you for it, and it's 'Oh, they had surgery'," she told The Huffington Post about her weight loss in March. "I think other people's experiences of doing things like that have cut people short of believing that it is possible. You can do it -- I'm an example of that." 

Scroll through the gallery to see other celebrities and their weight loss.