Pretty Woman by Fern Michaels
I just finished reading this one. I really liked it as well and all her other books as well.
In Fern Michaels's extraordinary, inspiring New York Times bestseller, an overweight woman sets out to improve her life by losing fifty-five pounds -- and ends up changing much more than her dress size!
Rosie Gardener fell under the spell of handsome Kent Bliss, and not even her best friend Vickie could persuade her that her fiancé was a two-timing cad. Now it's her third wedding anniversary, and Rosie, fed up with Kent's mistreatment, realizes her estranged best friend was right. But the day after kicking Kent out and beginning a diet and exercise regime, Rosie experiences another life-changing event: she wins $302 million in the Wonderball lottery. Now with Kent lurking in the shadows to claim a share of her money, Rosie needs her friends more than ever. As she works out under the eye of sexy personal trainer Jack Silver, a stronger new Rosie emerges -- a woman who wants to learn to trust love once again. Can she keep her vow not to be stopped by Kent's bitterness and her own self-doubts and jump into life with a passion she didn't know she possessed?