Although it's easy to forget, celebrities are only human.
As the years change so do they and 2011 was no exception. What is shocking however, is how much some of them have changed in just a year.
Whether it's weight loss or weight gain, a boob job or a nose job, all of these celebs have undergone huge physical transformations big enough to keep us guessing what they'll look like this time next year.
Check out the biggest celebrity transformations of 2011: