It's hard to believe that Jamie-Lynn Sigler gave birth just eight weeks ago. The new mom showed off her svelte post-baby body during an outdoor workout on Monday, Oct. 21. Layering a long-sleeved Henley over a black tank top and yoga pants, the Sopranos star went for a power walk in L.A. Following 36 hours of labor, the 32-year-old actress welcomed son Beau Kyle on Aug. 28. The newborn weighed 8 lbs., 4 oz., at the time of his birth.