Jennifer Hudson

Jennifer Hudson has long been the target of media scrutiny for her bodacious bod, but the new mom has been sporting a slimmed-down look as of late thanks to Weight Watchers. Hudson, who gave birth to son David Daniel Otunga Jr. just 7 months ago, announced to PEOPLE today that she has signed on as the latest spokesperson for the weight-loss company. Of her weight loss, the actress, who gained over 20 pounds for her Oscar-winning role as Effie in 2006's 'Dreamgirls,' says, "[It's] A lifestyle change, not a diet."

"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," says Hudson. The ease of the plan is a major factor in the busy mom's success. She says, "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."

Hudson joins Lynn Redgrave, Jenny McCarthy and Sarah Ferguson, all of whom have appeared as spokespeople for the brand.