Celeb Weight-Loss Winners

See how Halle Berry, Jennifer Lopez and more hit the gym and shaped up for '09!

Credit: Scott Kirkland/INF; Janet Gough/Celebrity Photo

Updated: Friday Jan 30, 2009 | 06:00 AM EST

SETH ROGEN

The 26-year-old Knocked Up star has been working out with trainer Harley Pasternak to prepare for his superhero role in The Green Hornet.