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14. Keri Russell and Matthew Rhys
The Americans stars Keri Russell and Matthew Rhys brought their first child into the world in May of 2016. It took the public almost a full month to discover the little boy, Sam Rhys, even existed, let alone that Russell had been pregnant the nine months prior.

Russell, 40, didn't share any details on Sam until she appeared on Today, telling host Matt Lauer her baby boy was "so good...big and fat and nice." The new baby is Russell's third child; her previous daughter Willa and son River are products of a past relationship with carpenter Shane Deary.