You all know about Mary-Kate and Ashley Olsen, Tia and Tamera Mowry and Joel and Benji Madden, but did you realize that Alanis Morissette was a twin?
Believe it or not, there are over a dozen celebrities who grew up sharing a special connection with a twin of their own, including Scarlett Johansson, Vin Diesel, Ashton Kutcher and Gisele Bundchen.
Plus, did you know that The Wanted's Siva Kaneswaran has an identical brother? Crazy, right?
Check out 23 surprise celebrity twins below:
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Gisele and Patricia Bundchen
<a href="http://www.people.com/people/ashton_kutcher/0,,,00.html">Gisele's sister Patricia</a> may not be a supermodel, but she's equally as gorgeous as her Victoria's Secret Angel twin. They grew up with four other sisters: Raquel, Graziela, Gabriela and Rafaela.
Scarlett & Hunter Johansson
Scarlett has a twin brother, Hunter, who appeared alongside his sister in the movie "Manny & Lo." He was also a campaign adviser for President Obama.
Ashton and Michael Kutcher (pictured left)
That's right! Ashton has a twin brother, who currently lives in their home-state of Iowa with his 8-year-old son. Michael was diagnosed with cerebral palsy at a young age and had a heart transplant at 13. "Ashton never left my side," Michael told People <a href="http://www.people.com/people/ashton_kutcher/0,,,00.html">of his brother's devotion</a> through the procedure. "He showed me the love one brother has for another."
Dylan and Cole Sprouse
The 20-year-old twins starred in "Big Daddy," before landing their own TV show, "The Suite Life with Zack & Cody."
Aaron and Angel Carter
Aaron, who has a famous brother -- Nick of the Backstreet Boys -- also has a twin sister! "There’s definitely like a twin connection," <a href="http://realitytv.about.com/od/houseofcarters/a/angelinterview.htm">Angel said</a>. "It’s not like you love them more or anything. It’s just that you connect with them more, you know?"
Alanis and Wade Morissette
The 38-year-old singer has a twin brother, Wade, who's an indie pop-rock musician, yoga instructor, therapist and author. Alanis' son Ever and Wade have the same middle name -- Imre.
Jon and Dan Heder
You all remember "Napoleon Dynamite," right? Well Jon Heder starred in that. His twin brother Dan works behind the scenes in visual effects.
Kiefer and Rachel Sutherland
Kiefer, 45, is seven minutes older than his twin sister Rachel, who works behind the camera in Hollywood as a post-production supervisor.
Vin Diesel and Paul Vincent
Vin, 45, has a fraternal twin brother, Paul, who is a film editor.
Aaron and Shawn Ashmore
The 33 year olds are both actors -- Shawn starred in "Animorphs" and as Iceman in the "X-Men" films, while Aaron was in "Smallville" and "Warehouse 13."
Siva and Kumar Kaneswaran
Siva, who is a member of British boy band The Wanted, has a twin brother Kumar, who looks JUST like him. (Siva left, Kumar, right)
Charlotte and Samantha Ronson
The 35-year-old fashion designer and her DJ'ing sibling are not just sisters ... they're twins!
Jason and Jeremy London
The 40-year-old twin brothers are both actors -- Jason was in "Dazed and Confused," while Jeremy starred in "Party of Five," "7th Heaven," and "I'll Fly Away."
Barbara Pierce Bush and Jenna Bush Hager
They may not look alike, but Barbara and Jenna are the fraternal twin daughters of George W. Bush and Laura Bush.
Mary-Kate and Ashley Olsen
The 26-year-old twins shocked many "Full House" viewers when it was revealed there were actually two Michelles! Now, Mary-Kate and Ashley are successful business women and own their own fashion line, Elizabeth and James. They're also the older sisters of Elizabeth Olsen.
Tia and Tamera Mowry
Sister, Sister! Tia and Tamera have been in the spotlight since the '90s and now have their own reality show, "Tia & Tamera."
Benji and Joel Madden
If you're a fan of Good Charlotte then you know the Madden brothers are twins (if you don't, it's pretty obvious). Joel is now married to Nicole Richie.
Tiki and Ronde Barber
Tiki, who is now an on-air personality, started out playing football for the New York Giants. His identical twin brother Ronde plays in the NFL with the Tampa Bay Buccaneers.
Joseph and Jacob Fiennes
The "American Horror Story" star, 42, has a twin brother, conservationist Jacob. They're the younger siblings of actor Ralph Fiennes, filmmakers Sophie Fiennes and Martha Fiennes and composer Magnus Fiennes.
Parker and Christopher Posey
Parker, 44, has a twin brother, Christopher, who stays out of the spotlight. They were born in Baltimore, Md., and grew up in Monroe, La.
Olly and Ben Murs
The 28-year-old British singer has a twin brother, Ben, who was <a href="http://www.dailymail.co.uk/tvshowbiz/article-1305183/X-factor-tore-family-apart-Olly-Murs-twin-reveals-heartbreaking-rift-finalist.html">quite angry when Olly missed his wedding</a> while competing on UK's "The X Factor."
Aimée Ann and Katy Ann Duffy
Singer Duffy, who is known for her hits "Mercy" and "Warwick Avenue," has a twin, Katy Ann. She also has an older sibling, Kelly, and writes songs about both of her sisters.
Elvis and Jesse Presley
Elvis' identical twin brother Jesse, delivered 35 minutes before him, was stillborn.