Rachelle Lafevre & Jamie King: To Diet For

Twilight's bad-girl vampire Rachelle Lafevre and her Tudors boyfriend Jamie King are totally losing it together -- weight, that is.

The pound-shedding pair is on the Fresh Diet program, a customizable meal-delivery service. "They figure staying on track with a healthy lifestle is easier when you do it with the person you're dating," says a pal of the two.

And their good influence on one another seems to extend past meals. "Jamie helped Rachelle learn her lines for Twilight!" the friend reveals.