Oscar-nominated singer and actress Queen Latifah has signed up to be the latest celebrity spokesperson for the weight-loss chain."We officially confirm that Queen Latifah will join the Jenny Craig program in January," Scott Parker, Jenny Craig's vice president of marketing, told PEOPLE Magazine. "We are thrilled to have Queen Latifah support our mission of improving health by taking her first step toward achieving a more healthful lifestyle." Parker adds: "Queen Latifah joins forces with Jenny Craig to communicate the importance of how small lifestyle changes, in the areas of diet and exercise, can have positive effects on overall health." The 37-year-oldHairspray star, who has consistently celebrated her plus-size figure over the years (including a recent PEOPLE cover story), will have a "very different campaign, focused on a healthier lifestyle, not on getting onto a specific dress size," says Parker. Of her figure, Latifah told PEOPLE in October, "I would say I'm voluptuous."