10+ Celebrities Fans Didn't Know Had Siblings

Unless you’re a Big Brother fan, you probably wouldn’t know that Ariana has an older brother named Frankie.

The self-professed “Social Media Mogul” was featured on season 16 of Big Brother U.S. where he placed fifth.

Ashton is super close to his brother, Michael, who has cerebral palsy.

The actor even once said that he wished he could give his heart to his brother who needed a heart transplant when he was a teenager.

She has a twin brother named Hunter. As such, the pair share a special bond.

"I mean, we've been together since the womb," she told Glamour in 2014. "We're very protective of each other. I think that has to do with us being twins but also our upbringing."

Emma has a younger muggle brother named Alex who is very close with his sister. While he, too, gets behind the camera, it’s for modeling instead of acting.

Unfortunately, we haven’t heard much from Alex since a 2010 Burberry campaign.

Can’t get enough Brad? Look to his younger brother, Doug. He’s a highly successful businessman and philanthropist.

He was actually inspired by Brad to become a Goodwill Ambassador for the United Republic of Tanzania.

There’s a good chance that Lady Gaga gets fashion advice from her fashion designer sister, Natali Germanotta.

As a stylist as well, Natali has styled on sets, such as A Star is Born. She also accompanied Gaga to the 91st Academy Awards.

Talent clearly runs in the Efron family. Zac has a younger brother named Dylan who works as a producer.

He has been credited for work in films like A Star is Born, Chips, and Get Hard.

The Social Network star wasn’t the first one in his family to grace the big screen. His younger sister, Hallie, worked as a child actress in the movies Paulie and How to Eat Fried Worms.

She’s most well-known as “the Pepsi girl” in the Pepsi Commercials.

We tend to forget Jessica has a younger brother, Joshua, who’s equally as good-looking and talented.

He acted alongside his sister in Dark Angel and has since landed a more prominent role in L.A.’s Finest.

Since Malek is a pretty private celeb, we're not surprised he has a twin brother we didn’t know about.

You’ll often find Sami accompanying Rami to events, such as when he visited The Jimmy Kimmel Show.

“My brother is one of my best pals,” Tay shared about her younger brother, Austin, for National Sibling Day on Instagram.

This lucky brother has accompanied Taylor to numerous award shows over the years.

Musical talent runs in the Hudson family, as Katy’s brother, David, who goes by the stage name Hudson, released an album of his own in 2013.

You may have seen him when he accompanied Perry on the red carpet during the 2014 Grammys.

Cameron Diaz has a fraternal twin named Chimene. While they look alike, Chimene has remained in her sister's shadow as she never got her break as a musician, writer, or model.

Maybe she can step up now that Cameron quit Hollywood!

Since Blake’s mother, Elaine, worked as an acting coach and talent manager, it makes perfect sense that Blake’s older brother, Eric, would also be an actor.

Since he’s also gorgeous, he has modeled for Tommy Hilfiger, Levi's, and Abercrombie and Fitch.

J-Lo is sandwiched between the youngest Lopez, Lynda, and the oldest, Leslie. She even formed a charity with Lynda called the Lopez Family Foundation.

The Lopez sisters created it as a way to help women and children by creating health opportunities for them.

The Destiny’s Child superstar always has a best friend in her younger sister, Solange.

Sometimes, though, the family has had drama, like when Solange was filmed attacking Beyoncé's husband, Jay-Z, in an elevator over his alleged cheating...

In the past, Miley's younger sister, Noah, has talked about the difficulties of being her little sister.

“It was absolutely unbearable,” she told Harper's Bazaar. Now that she has her own musical career, things have hopefully changed.

Talent surges through this family, as Pattinson's older sister, Lizzy, competed on X Factor.

This wasn’t her first time performing, as she released a song with German duo Milk & Sugar that made top 20 in the UK! They also have a sister named Victoria.

While he's not as well-known as Chris, Scott Evans has starred in some notable TV shows.

This includes Fringe, Law & Order: Criminal Intent, White Collar, and Grace & Frankie.

He's cute like Chris, too!

Damon Wayans has three brothers, all of whom have their own respective careers in film and entertainment.

His younger brothers, Marlon and Shawn, are best known for the Scary Movie franchise, while his oldest brother, Keenan Ivory, is the creator of In Living Color.

Sorry, but that's not Sly in the picture above, it's his younger brother, Frank Stallone.

Over the years, Frank has written and composed music for a number of Sly's films. He's also a Golden Globe- and Grammy-nominated musician.

Angelina and her brother, James Haven, made headlines after several all-too-intimate encounters at the Academy Awards.

The brother and sister were seen locking lips for a cringeworthy amount of time on numerous occasions throughout the night.

What could be better than playing Super Mario Bros. with Penelope and Mónica Cruz?

I have no idea how Nintendo was able to successfully pitch this to the Oscar-winning actress. I guess the Cruz sisters are gamers. Who knew?

There's no mistaking this brother/sister duo, those eyes are a dead giveaway.

While it's true that Hannah hasn't pursued acting to the same degree as her older brother, she did make a short cameo in The Lord of the Rings: The Two Towers.

Isn't this just the cutest bonding experience you could ever hope to see between a brother and sister?

I for one am on board. I've been trying to help normalize the idea of guys painting their nails for years now.

Antonia Kidman is a minor celebrity in Australia. She's had small TV roles and a handful of network appearances over the years.

In this picture, we're bearing witness to three generations of Kidman women. Those smiles say it all.

Sofia comes from a large family and her younger sister, Sandra, is also an actress.

She's known for her role as Theresa Corazon in The Bold and the Beautiful and most recently she appeared in the Spanish language drama, Dos Hermanas, as well.

Zooey's older sister is none other than actress Emily Deschanel. Fans of the crime drama, Bones, will no doubt recall Emily from her role as Dr. Temperance Brennan.

If you thought Sarah Michelle Gellar had great chemistry with David Boreanaz, just wait until you watch Emily.

I don't know why I have such a difficult time believing that these two are brothers. It's probably because Owen looks like he just came from a day spent surfing at the beach, and Luke looks like the guy who does my taxes.

Kate's brother is actor Oliver Hudson, who played Martin on the criminally underrated and short-lived series, Splitting Up Together.

Oliver and Kate also have started their own podcast called "Sibling Revelry", on which they discuss and dissect their familial bond.

Working the red carpet is an incredibly stressful job. You need to be ready with fast questions, otherwise, you may miss your opportunity entirely.

One thing you should never ask your subject is, "how do I say your last name?" No wonder Rooney and Kate were so curt.

Chloe's brother, Trevor, is a producer for a company called Treetop Pictures, as well as the manager for TSquared Entertainment.

He's also had a number of small walk-on roles in films like Youth in Revolt, and worked as an executive producer on the film Kick-Ass 2.

I don't know why I was so stunned to realize that Elizabeth is the younger sister of Ashley and Mary-Kate Olsen.

Does this mean that there's a chance we could see a Full House Easter egg in an upcoming episode of WandaVision?!

It would appear that great hair and gorgeous eyebrows run in the Leto family. For those who might not be aware, Shannon is the drummer for Jared's band, Thirty Seconds To Mars.

Listen to a live performance here.

Dave Franco is the younger brother of acclaimed actor/director/producer, James Franco.

The brothers appeared on film together for the first time in the runaway hit, The Disaster Artist. Hopefully it won't be the last time we see them act alongside one another.