The Cinderella Pact by Sarah Strohmeyer is on sale for $4.99, down from its regular $9.99 in ebook edition.
Soon to be a Lifetime movie called "Lying to be Perfect" (Edit: The movie was released in 2010.)
When Nola Devlin is turned down for her dream job because she's overweight, she decides to become thin-or, at least, pretend to be. The alter ego she creates-the thin, British, hip, and did we mention thin Belinda Apple-is a smashing success who is offered movie proposals, national television appearances and even dates...though no one's met her in person, of course.
Then Nola takes Belinda a bit too far, and is forced to join "The Cinderella Pact" and drop the pounds. As the weight comes off, however, Nola's problems begin to mount.