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2. Angelina Jolie and Brad Pitt
Fans only discovered actors Angelina Jolie and Brad Pitt were expecting twins back in '08 when Jack Black referenced Jolie's expectancy during an interview to promote Kung Fu Panda. Whoops. While the couple clearly intended to go as long as possible without sharing the news, Black was evidently unaware of the secret. Twins Vivienne and Knox were the couple's fifth and sixth children.

Unfortunately, in 2016 Jolie and Pitt split after two years of marriage and 10 years together.