Celebrities Who Were Actually Pregnant While Filming

Naomi Watts / Eastern Promises

Watts learned she was expecting just two weeks into shooting the Russian-mob thriller, Eastern Promises. The news came after she had hopped on a motorcycle and driven through real traffic for a scene (oops!). Her research to prepare for her role as a midwife came in handy just a few months later, however, when she gave birth to her son, Sasha.