23 pairs of celebrities who look nearly identical

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We all likely have a doppelgänger in the world somewhere. It's not just everyday people who are running into their look-alikes. Celebrities do, too.

Amy Adams and Isla Fisher get mistaken for each other all the time. Fans are convinced others share such a resemblance that they must have been separated at birth.

If you've ever felt like you're experiencing déjà vu, these 23 pairs of celebrities may be the reason you're seeing double.

1. Sarah Hyland and Mila Kunis

The "Modern Family" and "Ted" actresses say they get mistaken for the other all the time. Upon meeting each other in December 2010 at a Nylon party, the two decided they'd pretend to be each other in public.

"She came up to me and said she gets called me all the time too," Hyland told InStyle. "She said that sometimes she pretends she's me because it makes her feel young. I asked if I could pretend to be her next time somebody asks me if I'm her, and she said OK."

2. Natalie Portman and Keira Knightley

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." 

3. Ralph Fiennes and Liam Neeson

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."