Celebrity makeovers and 'make unders'

Already this season, some of the world's biggest celebrities have gone through some pretty significant changes. Kim Kardashian got married, Jennifer Lopez broke it off with her other half and Jonah Hill turned in his picture-perfect image when he lost his cool with a paparazzo.

Still, these life changes are no match for the often unbelievable style and beauty transformations these and many other stars have made over the years. With new haircuts and hair colors, weight losses and weight gains, many celebrities have transformed from frumpy to sleek (and occasionally the other way around).

Click through the gallery below to see some of the biggest celebrity transformations over the years.