Sure, A-listers always claim their red-carpet-ready bods are simply the result of hard work, diet and exercise. But now former NFL linebacker Billy Romanowski tells Life & Style that the weight-loss supplement in his Nutrition 53 product line is the added ingredient in stars' body-perfecting regimens.

"It's a big hit with actresses for when they have to drop weight quickly for a role," says Romanowski, who claims Angelina Jolie and Britney Spears are fans of his all-natural shakes.

For more on how the stars take off the pounds, pick up the latest issue of Life & Style, on newsstands now!

Photo Credit: Rex; NCNA