After much speculation, everyone's favorite blonde du jour Margot Robbie finally confirmed her marriage to Director and now-husband Tom Ackerley with a playfully posed Instagram.

But this beloved celebrity past-time of  "I do"-ing it in secret has a much storied past. Take a flip through for some of the biggest shockers we're still dying to know about - including a few couples so successful at keeping their big day private, we bet you didn't even know they were married!

[Photo via @margotrobbie]