From Kim Kardashian's washboard abs to Kelly Osbourne's trim "Dancing" physique, check out which stars underwent the most shocking body makeovers of the year.

Weight Loss Makeovers of the Year

Kim Kardashian

Kim Kardashian is famous (and infamous) for her spectacular curves.

Kim Kardashian

Kim got back into her skinny jeans and wrote on her blog that she works out 3-5 times a week and does lots of lower body work to keep her thighs and renowned butt toned.

Khloe Kardashian

Fans would stop the reality TV star and say, “Oh, you’re the fat, funny one,” Khloe recently told Life & Style magazine.

Khloe Kardashian

Khloe started working out with her sister, Kim, and they kept their snacking habits in check. Khloe claims to have lost 20 pounds in four weeks.

Heidi Klum

Heidi said she “enjoys being pregnant.”

Heidi Klum

Klum tells “Extra” she “didn’t do much” to lose the baby weight. She admits to eating healthy and running around with her three other kids.

Octomom

“I topped 270 pounds while pregnant,” says Nadya Suleman.

Octomom

Nadya Suleman dropped a whopping 145 lbs. by hitting the gym when her kids hit the pillow at night.

Kelly Osbourne

Kelly Osbourne publicly battled her weight before “Dancing with the Stars.”

Kelly Osbourne

Kelly said that after starring “DWTS,” she went from a size 12/14 to a size 8/10.

Nicole Richie

This year Nicole delivered her second child, Sparrow James Midnight Madden.

Nicole Richie

Nicole is back to her red carpet weight.

Valerie Bertinelli

Valerie struggled with her weight for decades.

Valerie Bertinelli

Valerie managed to lose over 40 pounds as Jenny Craig spokeswoman and posed in a bikini for the cover of People magazine.

Tyra Banks

Tyra decided to stick to a diet.

Tyra Banks

She lost an astonishing 30 lbs! Tyra said she wanted to lose weight not to look better, but to feel better.

Jennifer Love Hewitt

Hewitt was teased by tabloids for having gained some weight…

Jennifer Love Hewitt

… and lost the extra pounds, showing off her great figure at the “New Moon” premiere.

Melissa Joan Hart

Melissa carried weight from her first pregnancy with son Mason and later her second son Braydon.

Melissa Joan Hart

Melissa went from 155 pounds to 113. She told People magazine, “It didn’t happen by magic -- it was as hard for me as it would be for anyone else.”

Ellen Pompeo

Ellen flashed her baby bump while leaving a restaurant in L.A.

Ellen Pompeo

Ellen looks better than ever after giving birth to daughter Stella Luna Pompeo.

Sherri Shepherd

Sherri says she was a “yo-yo dieter.”

Sherri Shepherd

“The View” co-host dropped 41 pounds and appeared on the cover of OK magazine in a bathing suit.

Alanis Morissette

The once-svelte rock star packed on weight.

Alanis Morissette

Alanis was determined to get back in shape, and turned to Dr. Joel Fuhrman's book “Eat to Live,” which recommends fruit, vegetables, beans and nuts, and avoiding meat and dairy products.

Tori Spelling

Tori Spelling was thrilled to welcome son Liam but wasn’t so happy about the weight she put on during her pregnancy, saying, “I gained 40 lbs.”

Tori Spelling

Tori hit the gym and showed off her amazing weight loss at New York’s Fashion Week.

Peter Jackson

Director Peter Jackson said he was determined to lose the weight.

Peter Jackson

Jackson stunned fans with his 70-pound weight loss while promoting his new film, “The Lovely Bones.”

Britney Spears

A pregnant Britney Spears at the premiere of “Charlie and the Chocolate Factory.”

Britney Spears

To get her famous abs back, Spears hit the gym at least 3 days a week for aerobics, jogging and weight training.

Ashlee Simpson

In Nov. 2008, the singer/actress gave birth to her first child, Bronx Mowgli Wentz.

Ashlee Simpson

Simpson bounced back to her petite size but admits she lucked out. “I mean, I’m 24-years-old, [I have] the genes from my mother and I did work out for three months,” she told People magazine.

Rebecca Romijn

In Jan. 2009, the actress welcomed twin girls, Dolly and Charlie.

Rebecca Romijn

Four months after giving birth, Romijn told “Extra” she dropped 60 lbs. thanks to breastfeeding!

Comments