It's funny, isn't it? One looks like the biggest player on the college football team and the other does a really good impersonation of the guy who only emerges from his room to go walking barefoot in a forest (because we all know one).
We're sure you don't need it spelling out who is who (just get Efron some shoes, please).
Fans have been sent into a frenzy because two stars who've now been revealed to be doppelgangers just happen to be two of Hollywood's biggest stars - Zac Efron and Jared Leto. What are the chances?
Looking at them both now, you're probably laughing at how ridiculous that seems - but we're not talking about right now. There's too much/little facial hair involved at the moment.
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It wasn't until an old picture of Jared Leto in his twenties emerged on Facebook that we realised just how much he used to look like our baby-faced fave.
And it turns out that their similarity hasn't gone unnoticed, as the picture was flooded with comments from people claiming they genuinely thought it was the High School Musical heart-throb at first glance.
One Facebook user commented: "Please tell me I'm not the only one who saw Zac Efron at first," while another added: "I thought it was Zac Efron but damn."
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A third Facebook user asked: "Wonder if him and the High School Musical guy are related."
'The High School Musical guy'. Well, it's one way to summarise a career.
Let's face it, the resemblance is uncanny, and it seems like both Zac and Jared are aware of their similarities - a few years ago the 30 Seconds To Mars frontman joked that he was Zac's grandfather.
While appearing on Much, Jared was asked whether he'd ever do a musical, before he responded with: "Like High School Musical 17? Yeah, maybe like the golden years of High School Musical.
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"I'm actually Zac Efron's grandfather!"
We prefer to think of them as long-lost brothers to be completely honest.
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And apparently everyone on the planet has someone roaming around who looks exactly like them. Scary stuff, right?
Even if it's true, the chances of ever meeting your doppelganger are pretty slim, considering there's about seven and a half billion people on the planet.
You're not going to bump into them down at the local pub anyway, that's for sure. We reckon it'd be pretty weird walking around with a constant mirror.
Featured Image Credit: PATopics: Entertainment, TV and Film, Celebrity, Music, Celebrity News, Lookalike, Zac Efron, Jared Leto, Celebrity Entertainment