In fact, the new mom revealed she's the new spokesperson for the company today.

"With Weight Watchers I am enjoying the weight loss because I'm doing it the right way I feel empowered with what I've learned, everything from portion control to what foods will help keep me satisfied," said the 28-year-old singer-actress. "It's a lifestyle change, not a diet."

The Oscar-winning actress who has a 7-month-old son, David Daniel Otunga Jr., with her fiancé David Otunga, 28, also likes how the diet fits into her busy lifestyle.

"I can follow the plan no matter where I am, still enjoy my favorite foods and even use the iPhone app to track my points," she said.

Hudson is no stranger to publicly discussing her weight: After being called "the big girl" as a contestant on "American Idol," the singer transformed her body for her Oscar winning turn as Effie in "Dreamgirls" by packing on more than 20 lbs. with a diet of "cakes and cookies and lots of friend food," she told PEOPLE.

She later lost the weight for the premiere of the film.

Past celebrities who have represented Weight Watchers include Jenny McCarthy, Duchess of York Sarah Ferguson and Lynn Redgrave.

For the original article, go to PEOPLE.com.