If you're looking to lose weight in the New Year, check out these resolution-inducing before-and-after pics of stars like Kim Kardashian and Christina Aguilera, who shed some serious pounds in 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.

christina-aguilera[Credit: Getty Images]

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

kim-k-bikini[Credit: Us Weekly]

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

chris-pratt[Credit: Splash / Instagram]

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

Jessica-Simpson[Credit: Splash]

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

chaz-bono[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.

miranda-lambert[Credit: Getty Images]

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

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