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If you’ve ever wondered why there are so many celebrity couples walking around who look like siblings, there’s a sociological explanation for that. Apparently, humans are more likely to be attracted to things that look similar to them. And, if you happen to be of the more attractive variety, hooking up with someone who looks like you means you won’t tarnish your precious “gene pool.” 

I guess that sort of makes sense, but that still doesn’t make these brother-and-sister-looking couples any less creepy:

1

Benedict Cumberbatch and Sophie Hunter

2

Blake Lively and Ryan Reynolds

3

Rochelle and Marvin Humes

4

Alexis Bledel and Vincent Kartheiser

5

Allison Williams and Ricky Van Veen

6

Courteney Cox and Johnny McDaid

7

Cynthia Nixon and Christine Marinoni

8

Jack and Meg White

9

Katie Holmes and Tom Cruise

10

Reese Witherspoon and Ryan Phillippe

11

Brooklyn Beckham and Chloë Grace Moretz

12

Tom Brady and Gisele Bündchen

13

Sharon and Ozzy Osbourne

14

Pete Davidson and Cazzie David

15

Joe Jonas and Camilla Belle

16

Luann and Kirk Van Houten

Source : https://www.distractify.com/entertainment/2018/08/17/1wCVa5/celebrity-couples-look-like-siblings