We think we know a lot about celebrities, what with them being famous and all. But even some of the most famous people out there who we see in the tabloids all the time are keeping things on the downlow about their lives that we would never guess. One of those things we tend not to know much about is the family life that they were born into. It's not that celebs are keeping their family secret, it just doesn't usually come up when they're discussing their next project.

It turns out that there are a lot of stars out there who are either fraternal or identical twins. And we're not talking the obvious ones like the Olsen's. Here is a list of 13 celebrities who have twins, most of whom are not famous even if they also work in a similar industry. Number one is truly shocking.

13 Tiki Barber

Tiki Barber started out playing football for the New York Giants and later became a successful on air personality. Well, football must run in the family because as it turns out he has a twin brother named Ronde who was also an NFL player. Ronde played cornerback for the Tampa Bay Buccaneers. They also have a brother named Tarik. After Tiki retired from the NFL in 2006 he became a correspondent for NBC's The Today Show as well as Football Night in America/Sunday Night Football. Ronde retired from football in 2013 and joined Fox Sports as a color analyst.

12 Aaron Carter

You probably knew of Aaron Carter's brother Nick Carter, who of course was one of the Backstreet Boys. But what you might not have known is that Aaron has a twin sister named Angel. Angel has spoken about what it's like having a sibling so close.

"There’s definitely like a twin connection. It’s not like you love them more or anything. It’s just that you connect with them more, you know?"

Aaron started performing in the music industry at the age of seven, and released his self titled debut album at the age of ten. He had quite an amount of musical success for a while, while his twin sister became a model. Aaron walked her down the aisle when she got married in 2014.

11 Alanis Morissette

Canadian crooner Alanis Morissette has a twin brother named Wade who is also a musician. Wade makes indie pop-rock music, and he is also a therapist, yoga instructor, and an author. Wade started studying music when he was a kid, and began playing and studying piano, guitar, and the djembe. After a trip to India, where he discovered devotional chanting, he started to combine the two into his own style of music. He says Alanis is "one of the biggest influences" in his life, and when Alanis named her son Ever she gave him the same middle name as Wade, Imre.

10 Jon Heder

Jon Heder is best known for his lead role in Napoleon Dynamite, but did you know that he is also an identical twin? Jon's twin brother Dan also works in the entertainment industry, but he mostly works behind the scenes in visual effects. The twins were born in Colorado and also have three other brothers and a sister. Napoleon Dynamite was actually expanded from a short film called Peluca which he also starred in after befriending the short's creator Jared Hess at BYU. Jon and Dan have actually starred together in a martial arts comedy series on the internet called Sockbaby.

9 Parker Posey

Actress Parker Posey has a twin brother named Christopher, and the two were born in Maryland to a mother who was a chef and a father who was an owner of a car dealership. Parker studied drama in college and got her big break on the soap opera As the World Turns. Her first big film role was in the now cult classic Dazed and Confused, and she continued on in the indie film world becoming an indie darling, which she has seen as a bit of a hindrance.

"I'm trying to work in studio movies, but they won't hire me. I get feedback from my agent saying, 'She's too much of an indie queen.' And then on the other side, my name doesn't get the financing to do a movie over $1 million. And I'm called 'the indie queen.' So it's really a challenging path because I know so much about the indie side of the business."

8 Elvis Presley

It's no surprise that you didn't know that Elvis Presley was a twin, since his identical brother Jesse was actually born a stillborn. Jesse was delivered first, and then Elvis was born 35 minutes later. Elvis was born in Mississippi and then moved to Tennessee with his family when he was 13-years-old. Elvis grew up to be an iconic singer and actor who has been called "The King of Rock and Roll." Elvis is the best-selling solo artist in the history of recorded music, and was successful in a variety of categories including pop, blues, and gospel.

7 Duffy

The Welsh singer Duffy (real name Aimee Ann Duffy), has a twin sister named Katy Ann. The two also have an older sister named Kelly. They must get along pretty well because Duffy actually writes songs about her sisters. Duffy is probably best known for her song "Mercy" with which she became the first Welsh woman to reach number one on the UK singles chart since 1983, a year before she was born. Duffy actually had a kind of crazy childhood, such as the time her stepfather's ex-wife got caught hiring an assassin to kill him, which landed Duffy in a safe house for a while.

6 Joseph Fiennes

Joseph Fiennes has most recently starred on American Horror story, but a lot of people will remember him from Shakespeare in Love. Well Joseph is another actor who has a twin, this time a brother named Jacob who is a conservationist. There are actually six siblings in the British family, which include actor Ralph Fiennes, filmmakers Sophie Fiennes and Martha Fiennes, composer Magnus Fiennes, and an archeologist foster brother named Mike Emery. Quite the accomplished crew. They are also distant cousins of the Prince of Whales. Joseph started studying theater in school and made his acting debut on stage.

5 Kiefer Sutherland

24 star Kiefer Sutherland also has a twin that works in the entertainment industry, a sister named Rachel, who is a post-production supervisor. Kiefer is older by seven minutes. The twins were born in England to two very successful actors, and Kiefer is actually named after a writer and director that directed his father Donald in his first feature film. When their parents divorced, Kiefer moved to Toronto where he studied acting, and eventually moved to Hollywood where he became roommates with Robert Downey Jr. Kiefer's film debut was in a movie that also starred his father.

4 Vin Diesel

It's hard to imagine two Vin Diesel's, but it's true, Vin has a fraternal twin brother named Paul who is a film editor. The two were born in Alameda, California to a mother who was working as an astrologer, and the boys never had a relationship with their father. Even though Vin never met him and was born to a white mother, he self identities as a person of color from what he has heard from his mom. The boys were ultimately raised in New York by their mom and their stepdad Irving H. Vincent, who was an acting teacher and a theater manager. Vin hit the stage at the ripe old age of seven.

3 Ashton Kutcher

Ashton Kutcher has a twin brother named Michael, who has cerebral palsy and had to undergo a heart transplant at the age of 12. It sounds like Ashton has been an awesome brother, as Michael has said:

"Ashton never left my side. He showed me the love one brother has for another."

According to Ashton however, the situation with his brother's health was so challenging for a while that he considered suicide to provide the heart that his brother needed to survive. Luckily his dad talked him out of it, and a heart for transplant became available shortly after.

2 Scarlett Johansson

Scarlett Johansson has a twin brother named Hunter, and while he might not be as well known as his sister, he is an actor as well. Hunter appeared alongside Scarlett in the film Manny and Lo...but he has also been a campaign adviser for president Obama. Their older sister Vanessa is also an actress, their mother  is a producer, and their grandfather was a screenwriter and director. Scarlett started studying theater as a child and made her film debut at the age of nine. But it turns out that the twins have more in common than we thought...because Scarlett has also been active in political campaigns as well.

1 Gisele Bundchen

Supermodel Gisele Bundchen has a fraternal twin sister named Patricia. The two grew up in Brazil with four other sisters named Raquel, Graziela, Gabriela, and Rafaela. Gisele and her siblings are the sixth generation Brazilians of German descent. They grew up in an area of Brazil where there is a large population of Germans, to two parents of German descent. In 1993 Gisele's mom urged her and two sisters Patrícia and Gabriela to join a modeling course, and then Gisele was discovered at a mall. These days Gisele is one of the most successful super models in the world.

sources: huffingtonpost.com

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