We tend to think of our favorite celebrities as one-of-a-kind. But the truth is, some of them look shockingly alike — at least as far as appearance is concerned.
From Leighton Meester and Minka Kelly to Will Ferrel and Chad Smith, these 15 celebrity look a-likes warrant a double-take to see exactly who's who. Check out our list of celebs who may as well be long-lost twins, and see if you can spot the difference.
Who's Who? Leighton Meester & Minka Kelly
Getty: Stefanie Keenan/Jon Kopaloff
The real-life best friends get confused for one another regularly and even acted together in the movie The Roommate.
Left: Leighton Meester
Right: Minka Kelly
Who's Who? Jaime Pressly & Margot Robbie
Getty: Gabriel Olsen/Steve Granitz
Despite the age difference, many fans point out that the two blonde actresses could be twins.
Left: Jaime Pressly
Right: Margot Robbie
Who's Who? Amy Adams & Isla Fischer
Getty: Amanda Edwards/Le Segretain
There aren't a ton of red-headed leading ladies in Hollywood, so you'd be forgiven for confusing the two at first glance.
Left: Isla Fischer
Right: Amy Adams
Who's Who? Keira Knightley & Natalie Portman
Getty: Alberto E. Rodriguez/Dave Benett
The two actresses are often mistaken for one another by fans. Knightley once alluded to being chased down by people calling her Natalie.
Left: Natalie Portman
Right: Kiera Knightley
Who's Who? Bella Hadid & Carla Bruni
Getty: Michael Stewart/Ferdaus Shamim
Though both supermodels are ages apart, the similarities are striking. People lost it when the two finally met in Cannes.
Left: Bella Hadid
Right: Carla Bruni
Who's Who? Jeffrey Morgan & Javier Bardem
Getty: Vera Anderson/Frederick M. Brown
The actors' uncanny resemblance to one another always leaves fans second-guessing who is who.
Left: Javier Bardem
Right: Jeffrey Morgan
Who's Who? Tom Hardy & Logan Marshall-Green
Getty: Dave J Hogan//David Livingston
People really freaked out when the two actors walked the same red carpet, prompting some to call out their similar facial features.
Left: Logan Marshall-Green
Right: Tom Hardy
Who's Who? Will Ferrell & Chad Smith
NBC Douglas Gorenstein
Comedian Will Ferrell once faced off with the Red Hot Chili Peppers' Chad Smith in a drum contest while sporting identical getups.
Left: Will Ferrell
Right: Chad Smith
Who's Who? Patrick Wilson & Will Arnett
Getty: David Livingston/Michael Loccisano
The actors' similar hairlines might make fans do a double-take.
Left: Will Arnett
Right: Patrick Wilson
Who's Who? Rupert Grint & Ed Sheeran
Getty: Ian Gavan/Isa Foltin
Both are English redheads, but only one played in Harry Potter, while the other is a Grammy-winning artist.
Left: Rupert Grint
Right: Ed Sheeran
Who's Who? Liam Hemsworth & Karen Khachanov
No, that wasn't Liam Hemsworth on the court at the U.S. Open.
Left: Liam Hemsworth
Right: Karen Khachanov
Who's Who? Jada Pinkett-Smith & Zoe Saldana
Getty: Jerod Harris/Tim P. Whitby
One plays Gamora in Guardians of the Galaxy, the other you've seen as Niobe in the Matrix movies.
Left: Zoe Saldana
Right: Jada Pinkett-Smith
Who's Who? Katy Perry & Zooey Deschanel
Getty: Jag Gundu/Frazer Harrison
Deschanel has opened up about her resemblance to Perry. "I was relieved because everyone kept saying ‘this girl looks so much like you’. And then I met her and I was like, ‘thank God she’s attractive!’ I was worried she was gonna be an unattractive person,” she told David Letterman in 2012.
Left: Katy Perry
Right: Zooey Deschanel
Who's Who? Stephen Colbert & Bob Saget
Getty: Nicholas Hunt/Ilya S. Savenok
While Colbert's rowdy humor and Saget's relaxed demeanor couldn't be more different, both stars sure do look a lot alike. Even their specs are similar.
Left: Stephen Colbert
Right: Bob Saget
Who's Who? Zach Braff & Dax Shepard
Getty: Alberto E. Rodriguez/Mike Coppola
The two actors are very much aware of how much they look alike. Once they even did a face swap, and the resulting photo was...something.
Left: Dax Shepard
Right: Zach Braff