15 Celebs You Didn't Know Had Hot Siblings

Obviously, there are plenty of good looking people in Hollywood but some of these attractive celebs have even hotter siblings that stay far from the spotlight. While some of these siblings have tried to attain the fame of their brothers or sisters, a lot of them stay pretty low-key which makes them even more attractive and mysterious. Who doesn't love a guy with a little mystery? There are also plenty of good looking celebs in Hollywood who are tragically taken but there's good news for the rest of us because many of them have single brothers who are even cuter. You'd also be surprised how many sexy celebs have average-looking brothers which is incredibly disappointing. (Brad Pitt's brother did not make the list). This list is for only the hottest of the hot.

There are many celebs on this list who have siblings who stay under the radar which is why you may have never heard of them before. There are two Marvel superheroes with super cute brothers and a pop star you probably didn't know was related to a Game of Thrones actor. Willow and Jaden Smith have a cute older brother who you may have never seen before and you will be (pleasantly) surprised when you see Eddie Redmayne's even hotter brother. You can thank genetics for these attractive celeb siblings. Basically, these celebs are super hot and their brothers are totally adorable.

15 Justin Theroux

Justin Theroux may be taken but don't worry because he has a younger brother on the market who has also been blessed by the Theroux gene pool (minus the receding hairline). There is not much known about Sebastian Theroux but we do know that he's Justin's step-brother, he was born in 1989, he looks very good in a leather jacket, and he is very, very handsome. The fact that there is so little known about him only makes him more attractive. Also, this Sebastian Theroux should not be confused with Sebastien Theroux who is a production assistant on The Americans. It's an easy mix-up but Justin Theroux's little bro doesn't appear to be in the movie business at all but they do have a cousin, Louis Theroux, who is a filmmaker. Maybe, at some point in the future, we will see Sebastian on the silver screen. Keep your fingers crossed.

14 Rihanna

We all know Rihanna is hot af but we didn't know that she had an equally hot brother! Rajad Fenty is the singer's younger brother and the two appear to be very close. They grew up in Barbados together and Rihanna is very protective of her little bro, once stating that she viewed him as a son. What that means is, if you were lucky enough to date Rajad, you'd have Rihanna watching you like a hawk. The two siblings like to hang out together at basketball games and they also recently celebrated his birthday in Palm Springs! What we know for sure about Rajad is that he is 21, he's an Aries, he has beautiful eyes, he looks great in glasses, and he is hilarious on both Instagram and Twitter. Oh, and his sister is Rihanna… he's pretty much the complete package… and then some!

13 Kate Hudson

With a mother like Goldie Hawn and a sister like Kate Hudson, it's obvious that Oliver Hudson would not only be an actor but also a very attractive one. Oliver Hudson's father is musician and actor, Bill Hudson, but, after his parents divorced after just three years together, he was raised by his mother and step-father Kurt Russell after they got together in 1983. Kate's older brother has appeared in many different TV shows such as Dawson's Creek, Nashville, Scream Queens, and Rules of Engagement. In addition to his acting career, he also launched FL2, a subsidiary of Kate's activewear line Fabletics. Oliver was married to Erinn Bartlett in 2006 in a ceremony that was officiated by a Buddhist monk and the couple has three children together, Wilder Brooks, Bodhi Hawn, and Rio Laura so he is very much taken. Oh, well.

12 Chris Evans

Chris Evans is the ultimate dream boat and it's clear that good looks run in the Evans family. Scott Evans is Chris' younger brother and he is just as cute as Captain America. Scott is an actor like his brother and he's best known for his role in the soap opera, One Life to Live. Another fact about Scott is that he's gay (sorry, ladies) and his big bro has been very vocal about his brother's orientation and his stance on LGBTQ+ rights. The What's Your Number? star told The Advocate that he was "down with the gays" and went on to say that he thought his brother's "gay buddies" were a lot of fun to hang out with. That's very woke of you, Chris, but maybe don't refer to them as "the gays."

Scott's character in One Life to Live, Oliver Fish, had a romantic relationship with a man named Kyle Lewis, played by Brett Claywell, which is cool and all but their storyline was eventually dropped and Scott was let go from the show in 2010. What a bummer.

11 Scarlett Johanson

Scarlett Johansson has a twin brother named Hunter and he is super cute. Hunter Johansson has dabbled in acting and was an extra in his sister's movie Manny & Lo way back in 1996. However, he seems to be a lot more interested in politics than acting. Hunter worked on President Obama's campaign in 2008 and his re-election campaign in 2012. He was also a community organizer for a political campaign in New York. Sometimes he shows up to accompany his sister at red carpet events but he's mostly pretty low key and stays out of the spotlight. In 2014, the twins hosted a benefit, Champions of Rockaway Hurricane Sandy Fundraiser, to help New Yorkers who were affected by Hurricane Sandy. The two grew up in New York and wanted to help give back to the city that they love. How sweet!

10 Alexandria Daddario

Alexandria Daddario has been in Hollywood for awhile so you might know her from the Percy Jackson movies, San Andreas, True Detective, or maybe you saw her in the new summer flick Baywatch and thought to yourself, "where do I know her from?"  You might be thinking the same thing about her brother Matthew who has been in the business for awhile as well! Matthew Daddario is best known for his role as Alec Lightwood in Shadowhunters. It's pretty obvious that Alexandria is incredibly good looking (her eyes are GORGEOUS) so it's no surprise that Matthew is good looking as well. What we know about Matthew is that he's 29, he grew up in New York City, he studied business at Indiana University Bloomington, he loves to read, and he likes watching cooking shows. Basically, he's perfect.

9 Jaden and Willow Smith

Sure you know Jaden Smith and Willow Smith but you may not be familiar with Will Smith's eldest son Trey. Before the Men in Black star was married to Jada Pinkett-Smith, he was married to Sheree Zampino from 1992 to 1995 and they had a son named Willard Carroll "Trey" Smith III. You may have seen Trey when he appeared in his dad's music video for "Just the Two of Us" in 1998 but he has definitely grown up a lot since then. He is now a DJ who goes by the name of AcE and has even enlisted the help of his step-siblings to appear in his music videos. He's 24 years old and he is totally cute. He's like an older and cuter Jaden Smith with a more normal Twitter account. Considering his dad is one of the biggest stars in Hollywood, he seems pretty down to earth and he really loves his family. Could he be any more perfect?

8 Lily Allen

It's hard to believe that the singer who sang the song "The Fear" and "F**k you" which we all danced to back in 2009 is the sister to Theon Greyjoy from Games of Thrones. Alfie Allen is Lily Allen's younger brother (and their third cousin is the singer Sam Smith) and Alfie has been in the business for awhile. Maybe you remember him in Agent Cody Banks 2: Destination London? No? Don't worry, you're not the only one. His big break was when he landed a role on Game of Thrones and he's getting better roles now than he did back in 2008 when he played the King's Messenger in The Other Boleyn Girl. He starred in the British thriller Confine and he will appear in The Predator which is the fourth installment of the Predator franchise. Hopefully he'll have a better fate in The Predator than he did in Game of Thrones.

7 Eddie Redmayne

In case the British cutie isn't enough for you, don't worry because he has three brothers who are equally as good looking and, in the case of Thomas Redmayne, even more attractive. Eddie Redmayne may have an Academy Award and he may be the star of Fantastic Beasts but his younger brother Tom is pretty successful himself. Tom previously worked for real estate consultants Cushman & Wakefield and he is currently the director of business development at WiredScore in England. This means that he's not only cute but he also has a good job which makes him even more attractive. Like Eddie, he also went to Eton (everyone important in the U.K. went to Eton apparently, including Prince William and Prince Harry). We also know that he is in his 20s, he's an entrepreneur, and he has less than 800 followers on Twitter.

6 Adam Levine

Bet you didn't know that Adam Levine had a super cute brother! He and his brother Michael may seem close on the red carpet and on Instagram but apparently Michael is angry at The Voice judge for outing him as gay way back in 2011. Adam outed his brother in Out Magazine in 2011 which caused Michael to post a long-winded, angry Facebook post about it. In the post he wrote, "I've pretty much always been comfortable in my own shoes, but ever since the article I've been featured all over the internet and in magazines because of my sexuality and I never wanted this." The Maroon 5 singer probably should have checked with his brother before telling the world about his orientation but it's good to know that the two are still close and they seem to spend a lot of time together despite everything.

5 Zac Efron

It's not surprising that the Efron family has been blessed with good looks and Dylan Efron is proof. Dylan is an actor like his brother but he works behind the camera instead of in front of it and he worked as an assistant to the executive producer of 2015's Get Hard. Not only is Dylan cute but he's also smart--he graduated from California Polytechnic State University's San Luis Obispo campus with a degree in Economics. The two brothers are incredibly close and they spend a lot of time at the beach and at Lakers games. The High School Musical star posted a poem on National Siblings Day written by Dylan in the 6th grade called "A Brotherly Thing." The poem starts out like this: "My brother is a movie star / And is only 16 / He doesn't have a job yet / Still, he thinks he is the queen." How cute is that?

4 James and Dave Franco

We know that James Franco has a hot brother named Dave Franco but there is another Franco who was also given the gift of the Franco genes. Tom Franco is the eldest of the Franco brothers and Dave Franco has said that he is the family favorite. He told Vanity Fair that Tom is "the best one-the best looking, the sweetest, the nicest, greatest guy to be around. We keep him to ourselves. He's our little secret.” Tom is an actor like his brothers but he hasn't been in as many films as they have. His last movie was The Devil Wears a Toupee in 2007. The most interesting thing about him is that he's a sculptor and a painter and he is also the founder and co-director of Berkeley's Firehouse Art Collective. He's cute and he likes art? It doesn't get any better than that.

3 Tia and Tamera Mowry

Tia and Tamera Mowry are famous sisters but they also have a younger brother named Tahj Mowry who is very, very cute. The twins may have been born in Germany but Tahj was born in Honolulu, Hawaii (their parents were both in the U.S. Army). Tahj starred on the sitcom Smart Guy as child prodigy T.J. Henderson and also as Teddy on Full House. He appeared in some Disney Channel TV shows like his sisters (he was the voice of Wade on Kim Possible and appeared alongside his sisters on Sister Sister). He also appeared in Star Trek: Voyager and Desperate Housewives. Not only is he an actor but he is also a musician. He released his debut single "Flirt" in 2015. What we know about Tahj is that he is 31, he loves Twin Peaks, and he played football in college. Who knew that the little kid on Smart Guy would grow up to be so cute?

2 Lupita Nyong'o

Lupita Nyong'o's brother Peter Nyong'o made a splash at the Oscars a few years back when he appeared on the red carpet alongside his sister. He also made it into that famous selfie that Ellen took along with A-listers like Brad Pitt, Jennifer Lawrence, and Bradley Cooper. He had a lot of new fans after he appeared at the Academy Awards that year which is totally understandable because he is incredibly attractive and he seems very sweet. Peter is in his early twenties and he studied at Stetson University in Florida. Before you fall too in love with him, Peter recently became engaged to Wanja Wahoro, a Kenyan musician who is based in Australia. On their five month anniversary, Wahoro posted a photo of her and Peter on her Twitter with the caption: "five months with this beautiful lion cub." So cute!

1 Emma Watson

Back in her Harry Potter days, Emma Watson's younger brother Alex Watson sometimes appeared with her on the red carpet. Back then, Alex looked remarkably like his sister--he almost looks like a male version of Hermione Granger! Now he is definitely grown up and he is sexier than ever. He is 24 years old and before he started modeling, he had a cameo in Harry Potter and the Sorcerer's Stone and also in The Order of the Phoenix. In 2010, he modeled alongside his sister for Burberry and the two practically look like twins. We know that he went to Bristol University to study politics, he's 5'11". Unfortunately he hasn't modeled in years since he is focusing on his education but we hope he decides to come back to modeling because he is very, very good at it.