With celebrity lives under the microscope, it's tough to miss when a star gains or loses a few pounds. But what tends to be more fascinating to the public is when a celebrity seriously slims down and looks completely different.


Recently many stars have gone through major weight transformations, be it for a role or otherwise, and when placed next to their former selves, they're nearly unrecognizable.


Check out our slideshow below of stars whose weight loss both shocked and impressed us.



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  • Nicole "Snooki" Polizzi




  • Matthew McConaughey




  • Christian Bale




  • Drew Carey




  • 50 Cent




  • Star Jones




  • Randy Jackson




  • Chaz Bono




  • Christina Aguilera




  • Kelly Clarkson




  • Kirstie Alley




  • America Ferrera




  • Rihanna




  • Marc Jacobs




  • Khloe Kardashian




  • Carson Daly




  • Christina Ricci




  • Courtney Love




  • Hilary Duff




  • Kelly Osbourne




  • Lea Michele




  • LeAnn Rimes




  • Miley Cyrus




  • Nicole Richie




  • Raven Symone




  • Seth Rogen




  • Jenni 'JWOWW' Farley




  • Jennifer Hudson




  • Jonah Hill




  • Jordin Sparks