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9. Leighton Meester and Adam Brody
Former Gossip Girl and O.C. stars Leighton Meester and Adam Brody got married in a super secret ceremony in February of 2014. In May of 2015, E! News reported Meester was pregnant with the couple's first child.

Baby Arlo Day joined the world in September 2015, although if it weren't for the kid's birth certificate, she'd probably still be a myth. The two have kept remarkably mum.