When a woman is pregnant, that doesn't mean that she's invalid.

That's what recent pictures of active soon-to-be moms would like to reach the world. Professional ballet instructor Mary Helen Bowers, doesn't let her pregnancy hinder what she loves: keeping a healthy lifestyle through ballet.

She is quite famous in the ballet world because of her creation of "Ballet Beautiful" exercise routine. Not to mention that she famously helped Miranda Kerr and Doutzen Kroes stay in shape for their fashion shows. She was also the instructor of Natalie Portman for her ballerina role in "Black Swan."

“They key to working out during pregnancy is listening to your body,” Bowers tells Yahoo Shine. “This time is about more than just you. My doctor closely monitors my exercise routine and I collaborated with medical experts for my prenatal video series.”

Unlike the previous controversial exercise pictures of pregnant women, Bowers received better criticism (perhaps because ballet looks more relaxing and less dangerous to the baby?). Kudos to you ma'am for keeping yourself in shape!