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It's like looking into a really famous mirror.
Only about three in 100 births are twins. So, when you think about it, the chance of a celebrity having a twin is pretty slim. But there are more of them than you probably realize. For instance, you know these two: Mary Kate and Ashley Olsen.
You may know these two as well. Sister, Sister stars Tamera Mowry and Tia Mowry. Ring a bell?
These two probably look familiar. Dylan and Cole Sprouse got early starts teaming up to play single roles in Big Daddy and more. They went on to star in their own show, The Suite Life of Zack and Cody.
There's a good chance you know these twins. They are Joel and Benji Madden. You might recognize them from their band, Good Charlotte.
Did you know Scarlett Johansson has a twin brother?
Scarlett's twin is Hunter Johansson. They might be the most attractive set of fraternal twins on the planet.
It's true! Ashton Kutcher also has a twin.
Michael Kutcher, Ashton's twin brother, was born with cerebral palsy and received a heart transplant as a teen. Naturally, Ashton had his brother's back every step of the way. Twins are so connected!
This is Shawn Ashmore. You recognize him from a handful of X-Men films, including X-Men: Days of Future Past. You might think you recognize him from Warehouse 13. If so, you have him confused with someone else.
Aaron Ashmore is Shawn's twin brother. I mean, just look at them together ...
Pretty obvious, right? These two don't make it easy on us. They starred together in shows like Smallville and Animorphs.
This is Nicholas Brendon. You know him from Buffy the Vampire Slayer. But did you know he has a twin brother?
Nicholas' twin is Kelly Donovan. Kelly once played Xander Harris' body double on Buffy the Vampire Slayer. When it's that easy, why not?
Speaking of twins as doubles ... Nicholas Brendon and Kelly Donovan aren't the only ones who milked the whole twin thing on screen. Terminator star Linda Hamilton, who also has a twin sister, did the same.
Leslie Hamilton is Linda's twin. Leslie played Sarah Connor's double in Terminator 2: Judgment Day.
This is Rami Malek. He stars in Mr. Robot. But did you know he has a twin?
This is Sami Malek. Yep. Rami's twin brother.
It's OK, Jimmy Kimmel. It can be tough to tell them apart.
This is Ronde Barber. You might remember him as a cornerback for the Tampa Bay Buccaneers. It's possible you got a tad bit confused when you also saw him play for the New York Giants. Well, that's not exactly what happened.
Tiki Barber was a Giants running back. See? It was a totally different guy! Tiki is Ronde's twin brother.
It's not hard to get them confused.
You know actor Giovanni Ribisi. He has starred in a number of films, including Gangster Squad, Ted, and Avatar, as well as on Friends. He's not the only star in his family, though. He shares the limelight with the same person who shares his birthday.
This is Giovanni's twin sister, Marissa. She appeared in Dazed and Confused, True Crime, Pleasantville and more. She's also married to Beck, which is pretty awesome.
Kiefer Sutherland has a twin, too. Can the world handle two Jack Bauers? Don't fret ...
This is Kiefer's twin sister, Rachel. Minutes count in 24, so it's important to note that Kiefer is just seven minutes older than Rachel. Rachel is also in the film industry, working behind the scenes as a producer.
Gisele Bündchen has five sisters. But one is a twin! And she's just as gorgeous as you think.
Gisele's twin sister's name is Patricia. Here she is on the right, next to her model twin sis.
Joseph Fiennes has a twin brother. The Shakespeare in Love actor's twin is a conservationist named Jacob Fiennes.
So does Vin Diesel. His twin brother's name is Paul Vincent.
Alanis Morissette also has a twin brother. His name is Wade.
Aaron Carter has a twin sister. If you're familiar with the Carter family, you already know this one.
Her name is Angel Carter. Remember her from House of Carters? Sure you do!
This is Samantha Ronson. She's a pretty famous DJ. OK, she's a super famous DJ! But did you know she has a famous twin?
This is Charlotte Ronson. Charlotte is Samantha's twin sister. She's also a well-known fashion designer.
This is Eva Green. You've seen her in Penny Dreadful and Casino Royale. And guess what? She has a twin!
Here's the Green family in 1997. Eva is on the far left and her twin sister, Joy, is on the far right.
Who else has a twin? Jon Heder. The Napoleon Dynamite star has a twin who is also in the film industry.
Dan Heder is Jon's twin brother. Dan, pictured here on the left, works in visual effects.
This is Jeremy London. Jeremy appeared in Mall Rats. If you think he looks so much like Pink from Dazed and Confused, this is why ...
This is Jason London. You guessed it: They're twins!