You've probably never realised that these celebs have twin siblings!

Ashton and Michael Kutcher

Michael lives in Iowa with his son. Being born with a mild form of Cerebral Palsy, he works as a spokesman and motivational speaker for Reaching For the Stars, which gives money towards the research and prevention of Cerebral Palsy.

Jon and Dan Heder

There are two talented Heder men working in Hollywood! While Jon's work takes him in front of the camera, Dan's is on the production end. Napoleon Dynamite's identical twin is an animator and is known for his work on 2006's Monster House.

Photo: Getty Images

Vin Diesel and Paul Vincent

Vin Diesel's fraternal twin brother Paul is known to shy away from the spotlight, but earlier this year the actor shared a picture of Paul standing next to his late co-star and best friend, Paul Walker. The caption read:

Pablo and my mother would have deep conversations... she claimed, that it was no accident that this on-screen duo has come to define brotherhood in Our millennium.
You see... the other guy in the photo is also named Paul... and although they look more alike, he is actually my twin brother

Scarlett and Hunter Johansson

Scarlett's twin brother is her frequent red carpet date, Hunter. He worked as a community organiser on Barack Obama's campaign for reelection.

Photo: Getty Images

Gisele and Patricia Bündchen

Gisele's fraternal twin Patricia gave up the runway and instead acts as her sister's manager and spokeswoman.

Rami and Sami Malek

You may not know that the Mr. Robot and Twilight actor has an equally handsome twin named Sami, who is a teacher in Los Angeles.

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," Angel said. "It’s not like you love them more or anything. It’s just that you connect with them more, you know?"

Photo: Getty Images

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)

Olly and Ben Murs

The 28-year-old British singer has a twin brother, Ben.