Lots of twins are non-identical, so it can be a surprise when we see them together! And there are plenty of celebrities who have a twin lurking in their shadow... And when they come out into the spotlight, it can be a real eye-opener!
Here are 12 celebrities posing with their twin. What about you? Do you have a twin? Are you identical, do you share any physical characteristics or are you as different as night and day?
1. Linda Hamilton and her sister Leslie
2. Joel Madden and his brother Benji
3. Aaron Carter and his sister Angel
4. Camille Cerf and her sister Mathilde
5. Jon Heder and his brother Dan
6. Alanis Morissette and her brother Wade
7. Ashton Kutcher and his brother Michael
8. Scarlett Johansson and her brother Hunter
9. Mark Sinclair Vincent (a.k.a Vin Diesel ) and his brother Paul Vincent
10. Giselle Bündchen and her sister Patricia
11. Siva Kaneswaran and his brother Kumar
12. Kiefer Sutherland and his sister Rachel