Jessica Simpson, Jennifer Hudson and More Stars Who Love Weight Watchers

 Jamie McCarthy/; Earl Gibson III/FilmMagic

It's official! Jessica Simpson confirmed that she's going on Weight Watchers to lose her baby weight. "So excited to be part of the Weight Watchers family!" the 31-year-old tweeted Wednesday. The new mom, who gave birth to Maxwell Drew (her first child with fiance Eric Johnson) on May 1, joins other celebs who've used the diet program successfully; read on to find out other stars who are fans of Weight Watchers!

PHOTOS: Jessica Simpson and Eric Johnson's sweetest moments

Jennifer Hudson

The singer may be one of the diet's most successful spokespeople. Since 2010, Hudson, 30, has kept off the 80 pounds she lost following her pregnancy and credits Weight Watchers and her trainer Harley Pasternak for her success.

Jenny McCarthy

The 39-year-old joined Weight Watchers following the birth of her son, Evan Joseph, 10, and she has credited the diet plan for helping her learn portion control. Since then, the actress, author, and mom has also gone dairy- and gluten-free.

Ginnifer Goodwin

Talk about devoted! The Once Upon a Time actress has shared that she has been on Weight Watchers since she was 9 years old and continues to use the program after especially indulgent periods in her life. "It's the only thing on the planet that doesn't dehydrate you or just make you miserable," the 34-year-old has said of the diet.

Tina Fey

It took a turn in front of the cameras during the 30 Rock actress' early years on Saturday Night Live for her to decide to diet; Weight Watchers helped her lose the weight. Since then, the 42-year-old's weight-control strategy involves working out with a trainer, taking walks, and doing yoga whenever she can fit it into her schedule.

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