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Even celebrities have to work hard to slim down–and these ladies prove it!

Image may contain Mariah Carey Human Person Footwear Clothing Shoe Apparel Musician Musical Instrument and Crowd

TODAY – Pictured: Mariah Carey – NBC Photo: Virginia Sherwood

They hit the gym and made some serious transformations this year.

Their take-away tips can help you do the same.

The pop icon teamed up with weight-loss empire Jenny Craig to help her get back her pre-baby figure.

This image may contain Jordin Sparks Human Person Fashion Premiere Red Carpet and Red Carpet Premiere

AMERICAN COUNTRY AWARDS: Jordin Sparks arrives on the red carpet at the AMERICAN COUNTRY AWARDS at the MGM Grand Garden Arena live in Las Vegas, airing Monday, Dec. 5 (8:00-10:00 PM ET/PT) on FOX.

Now a spokesperson for the program, Carey is successfully slimmer (by 70 pounds!)

Mix up your workouts like Sparks–you’ll keep your body guessing and avoid getting bored!

Ricki Lake

Photo Credit: Adam Taylor/ABC

Ricki Lake is no stranger to weight-loss.

Image may contain Derek Hough Lighting Human Person Night Life LED Spotlight Dance and Leisure Activities

Enroll in a dance class today and you’ll be shimmying your way slim in no time.

Jennifer Hudson

Photo Credit: Michael Becker/FOX

The Oscar winner (and Idol vet!)

has spent the majority of 2011 as the spokeswoman for Weight Watchers.

Image may contain Lauren Graham Clothing Apparel Human Female Person Dress Woman Sleeve Blouse and Pants

She dropped well over 50 pounds and has been flaunting her new figure on the red carpet ever since.

Keep track of your meals daily and you’ll be more likely to be mindful of what you eat.

-Alyssa Longobucco

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Kick the New Year Off Right: Join Jump Start Now!

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AMERICAN IDOL: Jennifer Hudson peforms on AMERICAN IDOL airing Thursday, March, 24 (8:00-9:00- PM ET/PT) on FOX CR: Michael Becker / FOX.

Keep Your New Years Resolutions All Year!

Erase Your Health Mistakes

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