Ashton Kutcher has a twin named Michael, who was diagnosed with cerebral palsy at a young age. Michael lives in the brothers' native Iowa with his son and wife, who is also expecting a baby this year.
Scarlett Johansson's twin brother Hunter, who is three minutes younger than her, appeared in the movie Manny and Lo alongside her. He also worked on President Barack Obama’s 2008 campaign.
Supermodel Gisele has a twin named Patricia who also has good genes. The Brazilian beauties also have four other sisters, Raquel, Graziela, Gabriela and Rafaela.
You oughta know ... that Alanis Morissette has a twin brother, Wade!
This one is just awesome. While Jon was starring in Napoleon Dynamite, his twin brother Dan was working in special effects on the movie.
Kiefer Sutherland has a twin sister, Rachel, who works as a post-production supervisor in Hollywood.
Aaron Carter is best known as the brother of Nick Carter, but he also has a twin sister, Angel.
When Angel got married in February 2014, Aaron walked her down the aisle.
Jason Collins, the first openly gay NBA player, has a twin brother Jarron who starred along with him in high school and at Stanford. He is striaght, as the amusing t-shirt he made establishes.
Mary-Kate and Ashley Olsen
The most famous celebrity twins - so famous they often go by The Olsen Twins - Mary-Kate and Ashley also have another sister, Elizabeth.
Jenna and Barbara Bush
Jenna and Barbara Bush, the daughters of George W. and Laura Bush, are non-identical twins.
Joel and Benji Madden
Joel and Benji Madden of Good Charlotte fame are twins. Another famous pair!
Dylan and Cole Sprouse
The Suite Life of Zach and Cody stars Dylan and Cole Sprouse are all grown up ... and texting nude pics in Dylan's case.
Tia and Tamera Mowry
Sister, sister ... that's what we you could call Tia and Tamera Mowry.
Aaron and Shawn Ashmore
Aaron and Shawn Ashmore are actors, with Shawn starring in "Animorphs" and as Iceman in the "X-Men" films, while Aaron was in "Smallville" and "Warehouse 13." Michelle Trachtenberg? Not related to them.
The 35-year-old fashion designer Charlotte Ronson and her DJ sibling Samantha Ronson are not just sisters, they're twins!
Siva Kaneswaran, who is a member of British boy band The Wanted, has a twin brother Kumar (right).
Tiki and Ronde Barber
They played different positions, but Tiki and Ronde Barber both starred at the University of Virginia and in the National Football League.
Jill Hennessy of Law & Order and Crossing Jordan fame has a twin, also gorgeous sister, Jacque.
Karissa and Kristina Shannon
Remember Karissa and Kristina Shannon? If not, good for you ... but they were double-teaming Hugh Hefner for a time.