January 1, 2012 Biggest Celeb Slimdowns of 2011 Edit Delete Tags Autopost Jonah Hill dropped 30 pounds, Snooki ditched the extra weight, Mariah Carey debuts a slim post-pregnancy bod and more celebs who hit the gym in 2011! www.youtube.com/watch?v=4VMt9O_PmGsSource: http://www.celebtv.com/biggest-celeb-slimdowns-2011Justin Bieber Katy Perry Jennifer Aniston