If there's one thing Hollywood moms are good at, it's bouncing back into tip-top shape quickly after having babies. Some stay trim during pregnancy with frequent trips to the gym or yoga studios. Others claim breastfeeding is the key to a slimmer silhouette. Ellen Pompeo worked it out during her nine months and Sarah Michelle Gellar took to Pilates for firmer muscles. Reese Witherspoon plays ball for a good workout while Nicole Kidman spins to keep trim. Pals Gwyneth Paltrow and Madonna are often seen breaking a sweat together though Madge must be doing something else on the side to bump those biceps.

Which mama do you think deserves the title "Most Fit Mom of 2009?"