Noted shirtless person and actor Zac Efron has long been famous for his enviable abs. Lucky for Efron fans, it turns out the 27-year-old's younger brother has an equally impressive physique. Zac shared a photo of a brotherly piggyback ride with Dylan, 23, on his Instagram Monday, with the simple, timeless caption, "#brothers."
Zac recently posted another adorable family photo on Twitter -- a throwback for Father's Day featuring his dad, David, with the two Efron boys. "My hero," wrote Zac, "My inspiration. Love you. And I'm jealous of your mustache."
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