Celebrity Weight Loss Transformations of 2013

Christina Aguilera debuted her slimmed-down figure at “The Voice” Season 4 finale. She credits yoga and an active lifestyle for her new look.

[Credit: Getty Images]

Kim Kardashian got her bootylicious body back after baby by working out and following the Atkins diet.

[Credit: Us Weekly]

Chris Pratt shocked fans when he unveiled his new “Guardians of the Galaxy” abs on Instagram in July.

[Credit: Splash / Instagram]

Jessica Simpson had two babies in two years, but had no problem bouncing back, thanks to Weight Watchers.

[Credit: Splash]

Chaz Bono has lost 85 pounds thanks to a “nutritionist, doctor and exercise plan.”

[Credit: Splash / Getty Images]

Miranda Lambert told People that her 30th birthday inspired her to get healthy. Eating right has been key to the country singer’s success.

[Credit: Getty Images]

"MasterChef" judge Graham Elliot is nearly unrecognizable after dropping 128 pounds with the help of sleeve gastretcomy surgery.

Weight loss update: now weighing in at 268lbs, down from 396lbs. Thanks everyone for the continued support! pic.twitter.com/qZyzPuScTZ

— GRAHAM ELLIOT (@grahamelliot) December 4, 2013