When she first burst onto the scene, most people believed she was way too skinny. In fact, many magazines used to tell Christina Aguilera to eat more and exercise less. But that all changed when, after giving birth to her first child, Christina Aguilera started putting on weight. Clearly, exercising less, not performing as much as usual and indulging in the wrong type of food made Christina put on more weight than ever. However, the star is now back to a much healthier weight and is looking fantastic again. Britney Spears Yet another female popstar who started off with an incredible figure and lost it along the way. Her abs were almost as famous as she was at some point but, after years of personal drama, two children, not exercising and eating way more than her tiny frame could take, Britney's weight rocketed like never before. Just like in Christina's case though, the star is much healthier now. Mariah Carey Much has been said about Mariah Carey's constant change of weight. One day she is slim and fabulous and the next she looks more bloated than ever. It has been confirmed that most of her photo shoots are airbrushed to make her look thin, and that is because the star hasn't been able to shed the weight she put on after giving birth to her children a few years ago. Russell Crowe He became one of the most loved and fancied actors after “Gladiator” became a huge hit in 1999, but Russell didn't manage to keep his incredible body for long and started putting on weight right after he found fame. Matthew Perry Better known as Chandler from “Friends”, Matthew Perry must have filled the void the hugely successful TV show left in his life with food.