30 Celebrity Look-Alikes That'll Blow Your Mind, Including Cillian Murphy and Pitcher Tyler Glasnow

We all know there are plenty of celebrity kids who bear striking resemblance to their parents and actual sets of twins in Hollywood, but some of the best star "twins" aren't related at all. Every now and then, a pair of unrelated superstars look so much alike that you'd be forgiven for confusing them — and if you've ever done a double take while looking at Bella Hadid and Jennifer Lawrence, Zac Efron and Kevin Zegers, or Nina Dobrev and Victoria Justice, we've got the ultimate treat for you.

Few stars look more uncannily alike though than Margot Robbie and Emma Mackey, who both star in the summer's most anticipated film, "Barbie." As it turns out, their resemblance is part of why Mackey was cast at all. "I've been getting told for years that I look like the girl from 'Sex Education,' who is Emma Mackey," Robbie told Buzzfeed in a July 9 interview. "She plays one of the Barbies in the movie pretty much because Greta and I thought it would be funny," she continued. "We were gonna do this whole joke about us looking similar."

In costume, however, the duo didn't end up looking as much alike as Robbie and Gerwig thought they would, so no jokes about their resemblance made it into the film. "Once we got all dressed up as our Barbies, we were kind of like, 'We don't actually look that similar,'" Robbie said. "Like, when she's got her brown hair and I've got my blonde hair, we don't look that similar, so we didn't put that joke in the movie." Still, Robbie noted that fans do frequently mistake her for Mackey in the real world. She added, "When people come up and say, 'I loved you in 'Sex Education,'' I just say, 'Thank you. Thank you so much.'"

And the other half of "Barbenheimer" — "Oppenheimer" — is anchored by Cillian Murphy, who also has a major celebrity look-alike: Tampa Bay Rays pitcher Tyler Glasnow. They look so much alike that even the Rays's Twitter account joked about it, posting a photo of Glasnow and writing, "[One] Ticket for Oppenheimer, please."

Of course, these duos are far from the only celebrity doppelgängers out there in the world. Keep scrolling to see some of the most mind-bogglingly, similar-looking stars who could totally pass as siblings.