23 pairs of celebrities who look nearly identical

Short, long, curly, or straight hair, Keira Knightley and Natalie Portman look strikingly similar no matter how you pair them.

The two look so similar, Knightley played Portman's double, Sabé, in "Star Wars: Episode I - The Phantom Menace."

Neeson has said people often confuse the "Harry Potter" and "Taken" stars. That shouldn't be too much of a surprise since the two have starred in multiple films alongside each other ("Schindler's List," "Wrath of the Titans"). The only difference is that Fiennes usually plays the bad guy while Neeson's the hero.

"He is one of my best, best, dearest friends. I keep getting fans and stuff mixing me up with Ralph because we have very similar profiles," Neeson said on The Jonathan Ross Show in 2014. "So I've been complimented on winning a Tony Award for my Hamlet, he's been complimented on the 'Taken' movies."

Despite the eye color difference, the "Arrival" and "Bachelorette" actresses get confused often. Fisher joked about the duo's striking resemblance in her cover story with Allure in January 2009.

"If 'Shopaholic' is a hit, then it was Isla Fisher in the movie," said Fisher. " ... and if it doesn't work out, it was Amy Adams."

Fisher used Adams' photo in her Christmas card this past year and fooled both family and friends.

The "New Girl" actress was initially kind of frustrated when fans confused the two.

"It's a little bit annoying, to be totally blunt," Deschanel told MTV back in 2009. "The only similarity that we have is that we look a little bit alike."

The actress has since appeared to warm up to the similarity.

"I was relieved because everyone kept saying ‘this girl looks so much like you,'" she told Letterman in November 2012. "And then I met her and I was like, 'Thank God she’s attractive!' I was worried she was gonna be an unattractive person."

We're not the first to confuse the "300" and "Children of Men" actors.

When it comes down to it, we remember Butler is more likely to star in romantic comedies ("Bounty Hunter," "P.S. I Love You").

Susan Sarandon said at the Glamour Women of the Year Awards in 2016 that she and Weaver get mistaken for one another.

"I wanna just clarify a few things. Sigourney may have left the stage but we are two different people. I have taken credit for 'Alien' many times and she's signed autographs for me,” she said at the ceremony, according to Page Six.

In 2014, Sarandon wrote an op-ed suggesting Weaver is her "bad-ass alter ego."

Ever since the two co-starred in "10 Things I Hate About You," we always thought Gordon-Levitt could play the late Ledger's twin.

Elizabeth Banks admitted she pretends to be Handler when people confuse her with the comedienne.

"I was sitting in Toronto and a guy walked up to me and said, 'Oh my god, my girlfriend loves you. She would die if I didn't get your autograph. This is so exciting!'," she said during an appearance on Lately's former show "Chelsea Lately" in 2011. "He's like, 'I just love your books. I mean, My Horizontal Life...' I was like, 'Oh, he thinks he's meeting Chelsea Handler.' I couldn't ruin it for him!"

The "Pretty Little Liars" actress has previously said she would always get mistaken for the singer when younger and she would play along.

"When I was young it was always Selena Gomez," Hale said on "Late Night with Seth Meyers" in 2015. "I thought it was really cool at the time because it was when [Gomez] was dating Justin Bieber, and I would put on my sunglasses and people would actually come up to me and think I was her. And I would actually pose for the pictures. I would go with it. I couldn't tell them I wasn't Selena."

Hale told the women of the View in 2016 she also gets mistaken for "Modern Family" star Sarah Hyland and Jenna Coleman ("Doctor Who").

When Jeffrey Dean Morgan entered Seattle Grace Hospital on ABC's "Grey's Anatomy" we had to do a double take to make sure he wasn't the Academy Award winner.

Morgan is now breaking hearts on "The Walking Dead."

The actresses are well aware that fans get them mixed up.

"We did 'Help' together and that was the first time we like grabbed each other and said, 'Let's look in the mirror,'" Chastain told Jimmy Fallon in 2015. "And we looked at our faces side by side and we were like, 'Okay, we look alike.'"

Chastain recalled how she was mistakened for the "Jurassic World" star later and how she sometimes just goes with it. The two are good sports about it though and have tried to clear up all the confusion.

Howard made a short dubsmash clip where she let's people know who's who. It caught the attention of Chastain who shared it on Instagram. In May 2015, Chastain shared a funny image on Twitter poking fun at how people can't tell them apart.

This is a running joke between the two that has been referenced numerous times on NBC's "Community."

McHale even took over Seacrest's Twitter handle and website one day.

The official Oscars Instagram even confused the two back in 2014.

In real life, the two are really good friends and take selfies with each other. They have a nickname for one another, too — huevos — which is Spanish for eggs.

The comedian and Red Hot Chili Pepper drummer know they look so similar that they took their rivalry to "Jimmy Fallon" in 2014 in a drum-off. The pair even dressed alike.

You can watch their competition here and see their equally humorous interview here.

Before Jennifer Lawrence became one of the biggest stars in Hollywood, there was Leelee Sobieski, who you may remember from "The Glass House." The two look strikingly similar whether they don short or long hairdos.

Sobieski — who some say also resembles a young Helen Hunt — left Hollywood to focus on being a mother to her two children.

People mix these actors up all the time, according to "Arrested Development" actor Cera.

"I bumped into Jesse on the street once and he told me he gets it once a day," Cera told the New York Post in 2014. "People think he's Michael Cera."

Cera said he gets mistaken for other people too, including Jon Heder ("Napoleon Dynamite").

If it weren't for Connelly's fuller brows, we would think these two were interchangeable.

Even Victoria Justice believes she's the "Vampire Diaries" star's real life doppelgänger. That's how she introduced the actress when she presented Dobrev with an award at the Teen Choice Awards back in summer 2015.

Fans later freaked out when the two took a photo together at polo event that same year.

Whenever we flip past ABC's "Castle" we think we're catching sight of "The Avengers" star on screen. In 2014, Fillion took to Twitter to discuss various celebs that fans think he looks like. How did he grade Renner? "Brothers."

Fillion said he has also spoken with Jason Bateman about their resemblance to one another.

A lot of people think the "Ugly Betty" star and season six winner of "American Idol" look similar, whether their hair is up or down.

Only one of these actors is Pee Wee Herman. The other you probably know from his role on "The Good Wife."

Even Matt Damon says he suffers from a case of mistaken identity every now and then with the "Transformers" actor. In 2013, "The Martian" actor told Absolute Radio that he discussed the fan confusion with Wahlberg.

"I've talked to Mark about this because he gets people [that] come up and say, 'I love you in 'The Bourne Identity,'" he said. "So Mark and I have a deal. If we're mistaken for one another, we have to be as polite as possible."

Damon said he has even signed his name as Mark's.