Unlike the philandering Mark, Eric Dane is a one-woman man. And his one woman, wife Rebecca Gayheart, is already back to her svelte self after giving birth to their daughter Billie Beatrice Dane in March. Mrs. McSteamy showed off her toned physique while shopping for baby accessories at The Right Start in Sherman Oaks on July 15, 2010. So, what's helped her slim down? Pilates classes — and tennis matches with her hot hubby. That explains it: If our workout routine involved watching Eric serve, we'd shed the pounds in no time.