We're going to go out on a limb and guess that we're not the only ones who have made the embarrassing mistake of confusing a couple for siblings.

The truth is, couples tend to take a great deal of inspiration from each other; they start wearing each other's clothes, picking up each other's accents, and more. Sometimes, it gets to the point that it feels like they're merging into one person.

However, this isn't the only reason that we sometimes confuse couples and siblings: it's science. A lot of us are attracted to people who look like us, both because we trust what's familiar, and maybe also because we're all a little vain.

Whatever the reason behind all this couple twinning, some of our favorite celebrity couples provide great proof that there's definitely something to finding a partner that looks like you.  We honestly can't say whether it's sweet or just strange, but considering how eerie the similarities are between some of these couples, we wouldn't be surprised if many of them opted for a DNA test before they got married.

Check out our list of celebrity couples that look the most alike, and prepare to be disturbed by the resemblance. We certainly were!

23 Justin Bieber And Hailey Baldwin Could Pass For Twins

They're a fairly new couple, but we can't be the only ones that have noticed the similarities between Justin Bieber and Hailey Baldwin. Mostly, we think it's the hair, but they are also similar heights and sizes. As you can see from the picture above, they've already started mirroring each other's facial expressions, which tends to up the initially subtle similarities. We must say, couples tend to look more and more alike the longer they're together, so at this rate, we may not be able to tell the difference between these two in a few years. Marriage is all about becoming one, we suppose.

22 Chris Hemsworth And Elsa Pataky Are Blue Eyed Beauties...

Isn't it funny how much Elsa Pataky looks like Princess Elsa? It is almost as if the character were modeled after her. Of course, we all know that her husband Chris Hemsworth is not too shabby either.

During his Thor era, with the long blond hair, he and Elsa looked more alike than ever.

They had the same long blond locks. If you add that on top of their similar skin tones and icy blue eyes, these two had us realizing that as much as we love them as a couple, they could definitely pass for siblings. Once Chris cropped his hair though, the similarities were much less obvious.

21 Rivaled By Alexis Bledel And Vincent Kartheiser

Alexis Bledel is known for her captivating blue eyes. We are just impressed she was able to find someone who was able to rival them. After meeting on the set of Mad Men, Alexis and actor Vincent Kartheiser fell in love and got married. The couple is pretty private, and the world did not know that he and Alexis had a child until one of Alexis' Gilmore Girls co-stars spilled the beans. We don't know what Alexis and Vincent's son looks like, but we would be pretty shocked if he didn't possess his parents' distinctly blue eyes and dark hair.

20 Leighton Meester And Adam Brody Are Totally In Sync

If you're like us, you would not have immediately thought that Adam Brody and Leighton Meester look that much alike. However, this picture clearly counteracts that argument.

In this picture, the curly brown hair, brown eyes, and pale skin make these two look like they're related.

Though Leighton is smiling more, their expressions also have similar levels of enthusiasm, which means that they are beginning to match each other's facial expressions. Redbook reports that these two have been married since 2014 and have one daughter together, and we certainly hope she was blessed with the same cheekbones as her parents.

19 Benedict Cumberbatch And Sophie Hunter Share Coordinated Expressions

Redbook said it best when it said this; "When the internet's boyfriend Benedict Cumberbatch and his wife look directly into the camera, it's like the same pair of eyes is staring into your soul twice."

It's not just that these two have pretty much the same exact eye color, it's that they look with them in the same way.

This may not make sense until you look at the picture above. We're not quite sure what was happening here, but these two are certainly in the same scene. We'd like to imagine that someone snapped this picture right after the couple had just learned a random relative was coming to stay with them for the weekend.

18 Jessica Alba And Cash Warren Have Matching Smiles

Perhaps the most interesting couple on this list, Jessica Alba and Cash Warren don't look as much alike now as they did when they started dating. In this early photo of the couple, the resemblance is uncanny.

It's clear that they possess similar skin colors, dark features, and matching smiles.

According to Redbook, the couple has been married for a decade now, but unlike all the other couples on this list who look more alike now than at the beginning of their relationship, these days the similarities between Jessica and Cash are less obvious. We'd argue this may be a result of Cash's graying hair. Though he's certainly no less handsome, the grey definitely makes him look less like his wife.

17 Gisele Bundchen And Tom Brady Both Look Like Models

There's so much that feels unfair about how much Gisele Bundchen and her husband Tom Brady look alike. They're already good looking on their own, but now it feels twice as intense.

Gisele and Tom have similar skin tones, eye colors, and bone structure.

It pretty much looks like one of them went through one of those apps that tell you what you would look like if you were the opposite gender and found a way to create their partner from there. Since the supermodel is so tall, Tom and Gisele are even close in height (she is 5'11 and Tom is 6'4 according to Google).

16 Ellie Goulding And Dougie Poynter Might Have Shared A Closet

We'd imagine that if someone asked Ellie Goulding and Dougie Poynter what they first saw in each other, the answer would probably be their reflections!

Despite having different eye colors, the matching shoulder-length blond hair and pale skin make these two look a lot alike.

The cherry on top is how similar their styles are. It's clear that these two are into a similar aesthetic, the leather jackets and neutral tone ensembles make that obvious. We can't see the rest of their outfits, but we'd bet they're both wearing ripped black jeans. This on and off couple sadly split last year, but Ellie tells the Daily Mail that they're still good friends.

15 Mario Lopez And Courtney Mazza Both Have Distinct Jawlines

Mario Lopez may be the more famous member of this equally attractive duo, but make no mistake: Courtney Mazza is a Broadway star. Married since 2012, this couple has two kids together, and we don't really have to wonder what they look like. In addition to the dark hair, brown eyes, and light brown skin, Mario and Courtney both have very distinct jawlines. They both have wide cheeks and small chins, and it makes their smiles one of a kind. We're not sure this couple knows how much they look alike, but we can only imagine that someone has pointed it out to them by now.

14 Maggie Gyllenhaal And Peter Sarsgaard Share A Very Specific Hair Color

We are not certain if this specific shade of reddish brown hair is either Maggie Gyllenhaal or Peter Sarsgaard's natural hair colors, but we love it either way. According to the Daily Mail, Maggie and Peter have been married since 2009 and have two children together.

But despite both of them being respected figures in Hollywood, they both tend to avoid the red carpet and are rarely seen together.

We think they are one of those couples that have very similar vibes, which is perhaps one of the reasons they look alike even though their facial features aren't exactly identical.

13 Denzel And Pauletta Washington Are Partners In Joy

Denzel Washington is Hollywood royalty, but sometimes people forget about his equally impressive life partner. As their son actor John David Washington pointed out in a recent interview, Pauletta is a Julliard graduate; "She was on Broadway working. She paid for the first date, she paid the bill, paid for the cab ride." It's no wonder these two were attracted to each other, seeing as they're both overachievers! It isn't crazy to assume they saw themselves in each other in more ways than one, just look at their equally dazzling smiles! After more than thirty-five years of marriage, we can literally see how in sync these two are.

12 Portia De Rossi And Ellen DeGeneres Might Be Merging Into One Person

Portia De Rossi and Ellen DeGeneres are a great example of how couples that don't look that much alike that the beginning of their relationship can sometimes change to look more and more alike. Lately, Portia has been sporting a short bob much like her wife Ellen's. This was the change that made their similarities most apparent. Don't get us wrong, we know there's an age difference between these two (Ellen is sixty and Portia is forty-five), and Portia is also clearly taller than Ellen, but there's something in their smiles that seems similar. We can't quite put our finger on it, but it's clear this look-alike couple is doing pretty well together!

11 Courteney Cox And Johnny McDaid Share Dark Hair And Blue Eyes

Much like Elsa and Chris and Alexis and Vincent, the most obvious similarity for these two is in the eyes. Aside from the matching blues, however, actress Courteney Cox and her fiance, Snow Patrol member Johnny McDaid, both have dark hair and fair skin. To top it all off, they both have long, angular faces, and have clearly started to mirror each other's expressions. We can imagine that if we didn't already know who was in this picture, someone could easily convince us that these two are siblings. These two aren't even married yet, and they've already got the twinning thing down!

10 LeAnn Rimes And Eddie Cibrian Have Matching Smiles

When Eddie Cibrian and LeAnn Rimes first became a couple, the thing people were most interested in was the drama around their heated union. However, enough time has passed that people have forgotten about that. Now, we can almost understand why they were so attracted to each other, considering their similarities.

It's clear in this photo that they have similar smiles, but what's really interesting is their eyes.

Eddie and LeAnn have similarly shaped, hooded eyes, which we'd argue is a pretty distinct trait. There's something about these two that makes it seem like they're always flirting. We think Tyra would say that it's because they've mastered the art of the smize. 

9 Nate Berkus And Jeremiah Brent Even Have The Same Haircut

Nate Berkus and his husband Jeremiah Brent share a lot; a daughter, a career as interior designers, possibly a hairstylist, and their faces as well. It's eerie how much these two look alike; they're both handsome and somehow rugged and stylish at the same time. In this still shot, it's clear how much their mannerisms mirror each others. While Nate is forty-six, Jeremiah is thirty-three, but it's almost impossible to tell there's an age difference between the two. Nate and Jeremiah have a show together on TLC called Nate & Jeremiah By Design, and we can only imagine that the reality of being married and working together has sped up the process of them blending together.

8 Rooney Mara And Joaquin Phoenix Have A Lot In Common

Rooney Mara and Joaquin Phoenix may not have matching complexions, but they do have the same face shape and eye color. The couple also share their desire for privacy, an insider told Us Weekly, "they don't really go out...they're in their own bubble." Other things they have in common are their love for animals and their aversion to marriage. We wouldn't count on these two walking down the aisle anytime soon, or ever, but that doesn't mean they can't embrace the same twinning goals of the other couples on this list. The pair has been together less than two years at this point, and we can already recognize some similarities between them.

7 Seth Meyers And Alexi Ashe Know That They Look Alike

Talk-show host Seth Meyers has no qualms about the fact that he and his wife, human rights attorney Alexi Ashi, look-alike, he's already perfectly aware that it's true. Prior to the birth of he and Alexi's first child, he told People, "A lot of people have said my wife and I look alike, so I think that's we one thing we know, is that the child will look like us."

In addition to the dark hair and similar facial structures, Seth and Alexi also tend to mirror each other's expressions.

In this picture, it's apparent how similar their smiles are, and they happen to share similar expressions in a great deal of their red carpet pictures together.

6 Antoni Porowski And Joey Krietemeyer Could Easily Face Swap

We definitely love all the men of Queer Eye, but we must say that Antoni is the sweet, sensitive soul we see ourselves having deep late night talks with. Unfortunately, that will probably never be anything more than a fantasy. Antoni is very taken by his gorgeous look-alike boyfriend Joey Krietemeyer, who he's been with for more than seven years. As Elite Daily reports, Antoni says the two are practically married at this point.

Though these two have different passions (Antoni is a chef and Joey went to school for graphic design), one thing they definitely have in common is their faces.

They could easily face swap in this picture and we probably wouldn't know the difference.

5 Boris Kodjoe And Nicole Parker Have Discovered The Fountain Of Youth

Actors Boris Kodjoe and Nicole Parker are known as much for their work as they are for being ridiculously good looking. According to Essence, Boris is now forty-five and Nicole is forty-seven, but we're pretty convinced that they're both ageless. Just as they seem to get more good-looking every year, they also seem to be looking more and more like each other. Perhaps it just makes sense to connect them because both of them would have trouble finding more attractive partners. Then again, we would say that it's the caramel skin and bedroom eyes that make them look so much alike.

4 Jennifer Esposito And Louis Dowler Have Similar Face Shapes

Talk about an attractive couple! Actress and businesswoman Jennifer Esposito has been married to model Louis Dowler since November 2014, according to the New York Post. With their similar face shapes, skin tones, hair and eye colors, and facial expressions, these two could easily pass for siblings. Jennifer was briefly married to Bradley Cooper years before marrying Louis, which obviously did not last. We can't help but wonder if she found someone that fits her lifestyle more when she met Louis, because they certainly seem very in sync in this picture. Still, we can't imagine being unhappy about being married to Bradley Cooper.

3 Kevin Bacon And Kyra Sedgwick Both Look Like Sweethearts

Don't these two look adorable?! They look like they're staring into the eyes of a newborn baby, but apparently, they're just that happy to be together. Aww.  Though Kyra and Kevin clearly have different eye colors, they have similar smiles, wavy brunette hair, and kind eyes. They just both look like very sweet people! Redbook reports that these two have been together for a whopping three decades. Some might say that's a big accomplishment for Hollywood, but we say it's a pretty big deal, period. Like Denzel and Pauletta, these two have had a long time to get the twinning thing down. Whatever Kyra and Kevin are doing, it's clearly working.

2 Ciara And Russell Wilson Look Equally Aloof

We can't tell if Russell Wilson and Ciara are angry in this picture or just bored. Whatever it is, their expressions definitely match. Ciara and her husband Russell share light brown skin, dark features, and long faces.

Their marriage is still fairly new, and we are betting that they are only going to look more alike as their relationship goes on.

Who knows? They may look pretty unhappy in this picture, but perhaps in thirty-five years, they'll be on the red carpet with the same joyous smiles as Pauletta and Denzel Washington. We think that would be pretty darn adorable.

1 Chrissy Teigen And John Legend Share Their Sun-Kissed Skin

You know them, you love them, and you gotta admit that Chrissy Teigen and John Legend do look a little bit alike.

This A-list couple shares the same sun-kissed skin, full lips, and round cheeks.

According to Ethnic Celebs.com, Chrissy is of German, Norwegian, and Thai descent while John's ancestors are from Romania, Sierra Lione, and Guinea-Bissau. Though they do technically come from different backgrounds, they both have mixed ancestries, which perhaps explains some of the similarities. Then again, these two have been together more than a decade, so perhaps it is all just because they spend so much time together!

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