Katherine Heigl posted an underwear selfie to prove not everyone 'snaps back into shape' post-pregnancy

Getty/Astrid Stawiarz Katherine Heigl welcomed her third child — her first via pregnancy — in December 2016. The former "Grey's Anatomy" star recently opened up aboutthe difficulties of getting back in shape after giving birth. "I won't lie, the workouts are real a-- kickers but the progress I've made in only five short weeks has kept me motivated and inspired to keep going!" After adopting her first two children, Katherine Heigl gave birth to her sonJoshua Jr. in 2016. Now, over a year late...