Naomi Watts had undergone a substantial slim-down when she stepped in front of photographers just one month after giving birth to second child Samuel. "Nursing helps drop the immediate weight," claimed the naturally-thin actress. Watts also incorporated plenty of family exercise into her schedule, getting outside for regular bike rides and long walks with boyfriend Liev Schreiber and Samuel's big brother, Alexander.
A lean diet of vegetables and salmon and sessions in the gym helped Isla Fisher drop 55 pounds off her petite frame before she started work on Confessions of a Shopaholic—. "The trainer said I had a bad attitude. He told me I was genetically blessed because I’m little, but he did warn me that it was gonna catch up with me," Fisher has said. "I never work out, I just don’t enjoy it."