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1. Jennifer Garner and Ben Affleck
Jennifer Garner was so dedicated to keeping her second pregnancy on the down-low, she didn't even tell her co-workers. While filming 2008 film Invention of Lying, Garner's co-stars reportedly had no idea she was expecting her second child with Ben Affleck.

While Garner and Affleck are now separated, the family remains active and tight-knit. The couple continues to keep their three children out of the public eye.