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29 Surprising Celebrity Siblings You Would Never Have Guessed Are Related

Khloe and Kim Kardashian

They both enjoy showing off their curves for cameras, but Khloe and Kim really don't look that much alike.

Eric and Julia Roberts

Eric is the older brother of Julia. They both have toothy smiles, but would you know they were related if you weren't told as much?

Kate and Rooney Mara

Even with both sporting slicked-back locks in this shot, Kate (left) and Rooney (right) Mara don't look like sisters. They are both actresses -- Rooney did a complete transformation for her role in The Girl with the Dragon Tattoo, while Kate plays the Invisible Woman in The Fantastic Four reboot.

Jake and Maggie Gyllenhaal

Jake Gyllenhaal and his older sister Maggie have each had their individual successes on-screen and even appeared together as siblings in Donnie Darko.

Emilio Estevez and Charlie Sheen

Emilio Estevez is Charlie Sheen's older brother. Both are sons of Martin Sheen, but only Charlie kept using his dad's famous last name.

Andrew, Luke and Owen Wilson

With his dark hair and straighter nose, Luke (middle) looks little like his blond brother Owen (right). Neither of them look much like older brother Andrew (left).

Prince Harry and Prince William

They are both sons of Prince Charles and Princess Di, but would you know it by looking at ginger Harry and William, the latter of whom looks a lot like his mother?

Tori and Randy Spelling

Randy is Tori's little brother and is an actor, life coach and heir to the Spelling fortune.

Robyn and Blake Lively

Robyn is Blake's older sister and is also an actress, having appeared in Teen Witch and Twin Peaks. You'd never guess that they have the same parents.

Tallulah and Rumer Willis

They're both the children of Demi Moore and Bruce Willis, but Tallulah (left) and Rumer (right) aren't exactly mirror images of each other.

Jared and Shannon Leto

Jared is more handsome than his younger brother Shannon, but both have an ear for music. They cofounded the band Thirty Seconds to Mars in 1998.

Michael and Ashton Kutcher

Michael (left) is the fraternal brother of Ashton. Michael had a heart transplant when he was just a baby.

Joshua and Jessica Alba

Joshua is the younger brother of Jessica. Joshua is also an actor and appeared on the first season finale of Dark Angel, which starred Jessica.

Dave and James Franco

Dave and James Franco are both successful actors, but don't exactly look like biological brothers. Here they are pictured with their mother.

Zooey and Emily Deschanel

New Girl star Zooey (left) is the younger sister of Bones star Emily Deschanel. Both sisters have found success on the big and small screens.

Kevin and Matt Dillon

You know Kevin Dillon from Entourage and Matt Dillon from movies like Wild Things and the Wayward Pines miniseries, but you wouldn't know they were related just by looking at them.

Spencer and Abigail Breslin

Spencer Breslin is the older brother of Abigail and is also an actor, having appeared in Disney's The Kid and Santa Clause 2.Would you believe him if he was cast as the brother of Abigail in a movie?

Hunter and Scarlett Johansson

Did you know that Scarlett Johansson has a twin brother named Hunter? He appeared with her in the movie Manny & Lo.

Aimee and Kelly Osbourne

Did you know that Kelly Osbourne had an older sister, Aimee? Aimee didn't appear on The Osbournes, so we give you a pass for not knowing. Looking at this pictures, however, we're not even sure if these two are from the same planet, let alone the same family.

Oliver and Kate Hudson

Older brother Oliver and Kate Hudson are both Goldie Hawn's children, but one obviously looks more like her mother than the other. Oliver plays Jeff Fordham on TV's Nashville.

Liam, Chris and Luke Hemsworth

Good genes run in the Hemsworth family, but you can't help but notice that Luke (right) is built differently than Liam (left) and Chris (center).

Sofia and Sandra Vergara

Both Sofia and her younger sister Sandra are gorrrrrrgeous ( you have to aggressively roll your R's for Sofia), but not in an identical way.

Ben, Jennifer and Blaine Lawrence

On hand to celebrate Jennifer Lawrence's Oscar win were brothers Ben (left), Blaine (right) and her parents. We're not seeing the family resemblance so much.

Doug and Brad Pitt

Did you know that Brad Pitt has a younger brother? Doug (left) is not an actor, but he is the goodwill ambassador for the United Republic of Tanzania.

Kylie and Danni Minogue

These sisterly pop stars have each had their share of hits in their native Australia and elsewhere, but they don't share the same looks.

Ralph and Joseph Fiennes

Both Ralph (left) and Joseph Fiennes have had their share of big-screen successes as actors, but Joseph's darker hair and features make him look like he's not from the same parents that produced Ralph.

Ryan and Mandi Gosling

Ryan Gosling's older sister Mandi is photogenic like her brother, but we wouldn't know they were siblings unless you told us--so we're telling you now.

Kim and Keanu Reeves

Keanu Reeves became the caretaker for his sister Kim after she was diagnosed with leukemia.

Vin and Paul Diesel

Who knew Vin Diesel has a brother named Paul? Paul has a lot more hair to play with on his head than his famous brother.