There’s a running joke about how much Margot Robbie and Emma Mackey look a like, and it turns out, that’s exactly why she was cast in Barbie.

In a new interview with Buzzfeed, Margot opened up about their likeness and being mistaken for each other while out in their normal lives.

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“I’ve been getting told for years that I look like the girl from Sex Education, who is Emma Mackey,” Margot shared in the interview, as she and Ryan Gosling played with puppies on the set. “She plays one of the Barbies in the movie pretty much because Greta [Gerwig] and I thought it would be funny. We were gonna do this whole joke about us looking similar.”

There was even a specific joke written in the script to poke fun at how much they get confused for each other. But it was never used.

“Once we got all dressed up as our Barbies, we were kind of like, ‘We don’t actually look that similar,’” Margot shared with the outlet. “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.”

Emma has opened up about how many people confuse her for Margot in the past.

“It’s just a joke in real life. I’m like, ‘We don’t look anything like each other,’” Emma said. “I don’t mind it. It’s Margot Robbie. Are you kidding me? She’s the best. I look up to her so much. I don’t mind the comparisons. But it would be nice to move past that.”

Margot doesn’t really mind it either, and is happy for fans to confuse them.

“When people come up and say, ‘I loved you in Sex Education,’ I just say, ‘Thank you. Thank you so much.’”