It's a situation that everyone thinks about — what would it be like to be walking down the street and see someone who looks exactly like you? Unless you're an identical twin, the odds of this happening are pretty slim.
That is, except if you're a Hollywood A-lister... Whether it's on the red carpet or the big screen, there are some stars who leave us feeling like we're seeing double. From Emma Mackey and Margot Robbie to Sienna Miller and Mollie King, here are all the celebrities who look so alike it's scary.
Celebrity Lookalikes - Grazia
1 of 24Zoe Saldana and Thandie Newton
The two actresses could pass for twins — Thandie Newton revealed on the Graham Norton show that Victoria Beckham once had a full conversation with Newton thinking she was Saldana. Even worse, Saldana stated on the Late Late Show that even her mum gets the two confused.
2 of 24Jennifer Garner and Hilary Swank
Jennifer Garner and Hilary Swank have both spoken publicly about getting confused for each other by fans, and it's easy to see why.
3 of 24Mila Kunis and Sarah Hyland
Sarah Hyland first spoke out about being mistaken for Mila Kunis on the Ellen show in 2010 after they were mixed up at the Golden Globes. Hyland stated: 'People go to up to her and say, 'Hi. I love Modern Family. And she goes, 'Thank you so much!'" And so I'm like, 'You pretend to be me. Can I pretend to be you?"'
4 of 24Emma Watson and Kiernan Shipka
Playing on-screen witches isn't the only thing these two have in common — The Chilling Adventures of Sabrina star could easily be Emma Watson's little sister.
5 of 24Sienna Miller and Mollie King
Seeing double? Us too. How is it possible for two people to look so similar?
6 of 24Richard Madden and Gus Kenworthy
Olympian Gus Kenworthy gets compared to The Bodyguard's Richard Madden so often that he thinks nothing of it, even stating 'we could be brothers'.
7 of 24Emma Mackey and Margot Robbie
Almost as soon as Sex Education dropped on Netflix, the comparison between Mackey and Robbie began. Talking to PinkNews, Mackey agreed, stating: ''I mean, it's great, I'll take it. But I think Margot Robbie is, first and foremost, a very brilliant actress, actor.' Going on to say, 'I hope that people will see past the physical aspects of my person and focus on my job as opposed to my looks, if that's okay with you all.' We're definitely okay with that.
8 of 24Zach Braff and Dax Shepard
The two actors often joke about how similar they look — in 2013, Shepard tweeted '@zachbraff its been 2 hours since someone has pointed out that we look alike. I think twitter might be broken!' Then in 2018, Braff tweeted out a face swap of the two and you genuinely can't tell the difference.
9 of 24Indya Moore and Yara Shahidi
Pose star Indya Moore and Blackish actress Yara Shahidi, who both featured in the Juliet-inspired Pirelli calendar this year, could be sisters.
10 of 24Gillian Anderson and Dakota Johnson
There has to be some familial link here, right?
11 of 24Nina Dobrev and Victoria Justice
Nina Dobrev and Victoria Justice leave us feeling like we're seeing double.
12 of 24Courteney Cox and Caitlyn Jenner
After David Spade posted an Instagram with Courteney Cox and Nick Viall, loads of fans commented thinking Cox was Caitlyn Jenner. Cox herself even weighed in on the comparison, saying on Instagram 'Alright...I can see it.'
13 of 24Kylie Minogue and Hilary Duff
This one isn't noticeable at first, but once you see it, you can't unsee it.
14 of 24Amy Adams and Isla Fisher
It's been a longstanding thing in Hollywood that these two look eerily similar, but Fisher took it one step further in 2016 when she replaced herself with Adams on her family's holiday card. The worst part? No one noticed! Fisher stated on a visit to the Today show: 'I cut-and-pasted Amy Adams's face over mine, so it was Sacha, Amy, and the kids, and then we said, "Seasons greetings from Sacha and Isla" . . . And no one noticed. Everyone was like, Oh, your card was so cute. I was like, it was a joke, it's not me, it's Amy!'
15 of 24Gillian Taylforth and Kate Moss
The EastEnders star is dead ringer for supermodel Kate Moss.
16 of 24Rob Lowe and Ian Somerhalder
Dark hair, bright blue eyes, chiseled jaw — the similarities between these two go on and on.
17 of 24Rachel Bilson and Kaia Gerber
The OC star and the model could easily pass for sisters.
18 of 24Ashley Graham and Eva Mendes
Looking at these two side-by-side, it's hard not to think that they must be related somehow.
19 of 24Jessica Chastain and Bryce Dallas Howard
These two actresses have been confused for each other for years and the fact that they starred on-screen together in The Help probably didn't help. Ron Howard, Bryce's dad, has even gotten the two mixed up.
20 of 24Kevin Zegers and Zac Efron
You can't tell me these two aren't related. I won't believe it.
21 of 24Natalie Portman and Keira Knightley
Keira Knightley has spoken publicly about how she is often mistaken for Natalie Portman. It's no wonder she was cast as her double in Star Wars: The Phantom Menace.
22 of 24Antoni and John Mayer
The Queer Eye star has often been compared to singer John Mayer, and has even joked about himself on Instagram, posting a picture of the two side-by-side and cheekily saying 'I dunno, guys, I just don't see it.'
23 of 24Lili Reinhart and Amber Heard
Lili Reinhart has been compared to several other actresses — Brittany Murphy, Sarah Gadon — but the one we see most is Amber Heard.
24 of 24Katy Perry and Zooey Deschanel
This comparison is a tale as old as time; before the singer went blonde, the two could have been twins. In fact, Katy enlisted her for her latest music video, Not The End Of The World, where Zooey even wears a Katy approved blue wig.