Doppelgangers, a German word that means double walker, are people who look like you but are not biologically related. Sometimes it is portrayed by a ghostly or paranormal phenomenon which is deemed as a sign of bad luck. Other cultures and traditions see doppelganger as a person’s evil twin. Often, a person does not see their doppelganger but other people do. However, if you see yours then it’s a warning of death either to you or your twin.

For Dr. Teghan Lucas, a forensic anthropologist at the University of New South Wales and Flinders University in Australia, there’s only 1 in a trillion chances that people will have exact measurements of the face. At first sight with the naked, two people may look alike, but when you start the measurement of the head and the facial features, you’ll realize that there are fewer chances that people match each other.

However, with the experiences of being mistaken to someone make people tempted to believe that doppelganger is possible. Some celebrities are also mistaken with their look-alike that it takes a few more minutes to realize that you got the wrong person. Some celebrities just play along with it because they don’t want to ruin this atmosphere, while others admit on their interview whenever asked about it they feel frustrated.

To know which celebrities have their so-called doppelgangers, check out the list below. Even you will be surprised at how they look the same, even side-by-side.

Sarah Hyland and Mila Kunis

The actresses from the Modern Family and Ted are often mistaken by people because of their resemblance. On their meeting in December 2010, they just pretended to be each other. For Mila Kunis, getting mistaken to be Sarah Hyland is fun because it makes her feel young which is fine for Sarah.

Natalie Portman and Keira Knightley

Because of their resemblance, whether they have short, long or curly hair, Keira was able to play as Natalie Portman’s double in the Star Wars: Episode I – The Phantom Menace, as Sabe. But what makes Knightley different from Portman is that she is three inches taller and is at least four years younger. Another contrast that you can take from Portman and Knightley is the type of energy on the role they play. Portman is seen as more serious, humble and grounded, while Knightley tends to be rebellious.

Zooey Deschanel and Katy Perry

With their striking resemblance, Deschanel is kindly frustrated every time the fans mistake them to one another. Both actresses have big blue eyes, dark hair and pale skin that they will pass as a biological twin. They also have the same quirky fashion sense when dressing casually and when in the red carpets. Both are singers and have been on different acts which make it confusing for the fans. But thanks to Katy Perry’s usual changing of her hairstyle and hair color, fans got a little rest from the confusion.

Penelope Cruz and Salma Hayek

Calling each other as “huevos” which means egg, the two looks alike actress are good friends in real life and have been taking selfies with each other which makes a confusion of the two even more difficult. Even the Academy Awards had a hard time identifying which is which. Well, it’s not surprising that they look alike as Spanish and Mexican descents have features that look alike.

Gigi Hadid and Iza Ijzerman

The two models look exactly alike that the two can pose as a twin. Their similarities reached the Fashion World that when Ijzerman signed for a modeling agency, that was the only time she realized that they look alike after the agency posted a picture with the caption, “The new curvy Gigi Hadid. Iza was discovered as the long lost twin to Hadid in an Instagram photo for plus-size swimwear line. Since then, a lot of people have been following the beautiful Dutch Model and blogger. But Iza believes that she looks more like Bella, Gigi’s biological sister.

Selena Gomez and Sofia Solares

After seeing Selena Gomez and Sofia Solares, the internet loses it. Sofia and Selena resemblance to each other is evident in their eye shape, nose, and the lips. The way they take their photos on Instagram is even the same. Surprisingly, it turns out that Sofia is also a fan of Selena.

Nina Dobrev and Victoria Justice

When Nina Dobrev presented the Teen’s Choice award in the Summer of 2015, she introduced her doppelganger, Victoria Justice, the awardee. Upon seeing them together, fans freaked out to see them look exactly alike. And when the two photographed with Melanie Iglesias, they looked like triplets. And from this event, a good friendship started.

These are some of the celebrities and their doppelgangers. Some had a celebrity doppelganger while others were their fan. Some celebrities even meet their doppelgangers by chance, for instance in a commute the same thing that happened to another actress, Reese Witherspoon.