Celebrity Twins--Who Knew? These Celebs Are Also Twins

Who knew? While there are many sets of famous twins, there are also celebrities who happen to be twins. Their not-so-famous counterparts remain out of the limelight. Learn more about these celebrity twins and their twin siblings.

Actor Ashton Kutcher has a fraternal twin brother, Michael. His brother has cerebral palsy and required a heart transplant as a young age. Ashton was purportedly his brother's protector growing up and developed a compassionate side that belies the comedic prankster attitude he displays on television shows like That 70s Show and Punk'd. The actor and producer is married to actress Demi Moore.

This Golden Globe-nominated actress has a twin brother, Hunter. People.com named Hunter as one of its Single & Sexy Men of 2008. Although Hunter made an appearance in Scarlett's 1996 film, Manny & Lo, more recently he worked as a campaign organizer for Barack Obama. Scarlett Johansson is highly regarded for her roles in movies such as The Other Boleyn Girl, Girl With a Pearl Earring and He's Just Not That Into You.

Kiefer Sutherland started his career as a teen hearthrob in movies like Young Guns and The Lost Boys but his success really spiraled when he started saving the world as Agent Jack Bauer in the popular television drama 24. Kiefer and twin sister, Rachel, were born in London. Their parents, Donald Sutherland and Shirley Douglas, are also actors. His twin sister is in the entertainment business, but not in front of the camera. She works as a post-production supervisor and casting assistant for film and television.

Vin Diesel has made a career starring in action films like xXx and The Fast and the Furious but also wields his talents offscreen as a producer. His given name is Mark Sinclair Vincent, but took the stage name of Vin (short for Vincent) Diesel while working as a bouncer in a New York City nightclub. He has a fraternal twin brother named Paul who works as a film editor.

Supermodel Gisele Bundchen has a fraternal twin sister, Patricia. The pair are two of five sisters in their family, and grew up in Southern Brazil. She is a former Victoria's Secret model and one of the industry's highest-earning fashion models. In 2009, Gisele married New England Patriots quarterback Tom Brady. Her equally pretty twin, Patricia, has also modeled, but is primarily credited with the successful management of her sister's career.

The soulful singer-songwriter goes by the single name Duffy, but was named Aimee Ann Duffy at birth. She and her twin sister, Katy Ann, were born in Wales in 1984 but were separated when their parents were divorced when they were ten. Duffy moved out on her own to pursue a singing career at the young age of fifteen, but has found great success in Great Britain as well as around the world with her smooth, rich voice.

Canadian actress Jill Hennessy is best known for playing tough crime solvers in television dramas such as Crossing Jordan and Law and Order. Her identical twin sister, Jacqueline, is a magazine writer and TV show host in Canada. The twins starred together in the 1988 film Dead Ringers as well as a documentary spoof called The Acting Class in 2000.

Who knew Napoleon Dynamite had a twin? The comedic actor has an identical twin brother, Dan. They were two of six children in the Heder family, growing up in Salem Oregon. During an interview with David Letterman, Jon admitted that he and his brother "caused a lot of trouble by pretending to be the other" while growing up. As adults, the twins are partners in a production company.

Alanis Morisette is an award-winning pop star, one of the best-selling female artists of all time, with hits like Ironic and Uninvited. The Canadian singer has a twin brother named Wade. He is also a musician as well as a yoga instructor.

Superbowl champion and Pro Football Hall of Famer John Elway had a twin sister. Unfortunately, she passed away in 2002 from lung cancer, despite being a non-smoker. The powerful quarterback was devastated by her death, feeling powerless to save her. He described his sister as his closest friend and said that she kept him out of trouble growing up.