Jennifer Hudson at the Louis L. Valentine Boys & Girls club of Chicago during an appearance at a 7-Eleven promotion 'Coffee Cup with a Cause,' Wednesday, March 31, 2010 in Chicago

*Oscar and Grammy award-winner Jennifer Hudson was announced this morning as the latest celebrity to represent Weight Watchers.

The Oscar winner will begin appearing in ads for the weight loss company beginning Sunday, according to the Associated Press.

Hudson recently lost weight after the birth of her first child, a son with fiancé David Otunga. She says of her new weight loss gig, “It’s a lifestyle change, not a diet.”

Meanwhile, J-Hud has also designed a coffee cup for 7-Eleven as part of their “7-Eleven Coffee Cup with a Cause” charity campaign.

Her cup goes on sale today at participating 7-Eleven stores across the U.S. and will be available through May 31 or while supplies last. Proceeds from the cup featuring Hudson’s personal design will benefit her designated charity, Boys & Girls Clubs of America.

Hudson made a surprise appearance at a Chicago-area Boys & Girls Clubs of America location March 31 to formally announce her partnership with 7-Eleven and officially launch the cup’s sales. Featuring a brightly burning candle as the focal point, the cup is inscribed with the words “Light of Peace” in Hudson’s handwriting.

“7-Eleven’s ‘Coffee Cup With A Cause’ program not only lets me give back to an organization that really helped me while I was growing up in Chicago,” Hudson said, “but also is an opportunity to tell others about the great work this organization continues to do. The Boys & Girls Clubs provide safe places for kids to learn and grow, not just in Chicago but across our country and on U.S. military bases around the world.”

Throughout 2010, 7-Eleven will introduce limited-edition 20-ounce coffee cups designed by entertainment and sports celebrities to be sold in its U.S. stores. Proceeds from sales of the cups benefit the featured celebrity’s charity of choice. These cups can be filled with any 7-Eleven hot beverage and customized with a selection of creams, syrups and spices at no extra charge.