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Surprising Celebrity Siblings: Scarlett Johansson Has a Twin? (PHOTOS)

You know who they're dating, what they're wearing, and their entire exercise and diet routine, but you might not know anything about their siblings. We think it's time to brush up on those celebrity family trees!

These famous stars are always walking the red carpet and being photographed by the paparazzi, but what about their siblings? For starters, Scarlett Johansson's twin brother Hunter isn't on the big screen with his sister, but he was involved in the Barack Obama campaign, and he's also super hot. Demi Lovato also has a beautiful sister named Dallas, and she totally looks like the "Neon Lights" singer!

Click through the gallery to get to know more of your favorite celebrities and their siblings! Who are you most surprised by? Sound off in the comments!