• Zac Efron

Zac Efron (Photo : Instagram)

"High School Musical" star Zac Efron has let the world know that he has a "hot" brother when he posted a photo of them on Instagram on July 7. The photo went viral shortly, earning Dylan Efron fans from around the world.

Zac Efron posted a photo of him piggybacking on his brother, Dylan, 23, with the short caption "#bothers". The post surprised fans who did not know he has a brother.

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"So about Dylan Efron... Where has he been hiding all these years?" a fan wrote on Twitter.

Fans were also delighted as both Efrons were shirtless in the photo and Dylan's toned abs was exposed. Fans noted that the other Efron is equally hot with his pronounced jawline while some argued that he could be hotter, E Online reported.

"What I would give to be the filling in an Efron sandwich," another fan tweeted today. Similar reactions graced social media following Efron's post. Others notably regarded how lucky they are for now having two Efrons in the world.

While Zac's Instagram photo now has 505 thousand likes, Dylan's personal life seems to be missing from the social media. Apparently, he does not have any social media accounts where the followers he attracted could stalk him, according to News.com.au

In addition, there are no reports whether he considers joining his brother in Hollywood.

Meanwhile, Zac Efron's music drama film "We Are Your Friends" will be in theaters on Aug. 28. Two more films, "Dirty Grandpa" and "Mike and Dave Need Wedding Dates" are set for release in 2016.