Zac Efron posted a shirtless photo with younger brother Dylan to his Instagram on Monday, and it has shocked the world.

The older Efron shared the black and white photo of him goofing around while getting a piggyback ride from Dylan to his Twitter and Instagram, showing some brotherly love. "#brothers," the simple caption read.

The 27-year-old "Neighbors" star and his 23-year-old sibling made People's "Hollywood's Sexiest Brothers" list last year, and after seeing how ripped the two are, it's extremely obvious why.

In May, Zac Efron revealed a poem the Dylan had written in sixth grade, according to Us Weekly. It was called "A Brotherly Thing" and was all about how much he looks up to his older brother, the "movie star." Zac posted the poem to his Twitter and wrote, "When your dad goes through your little bro's old homework and finds a gem."

Zac Efron has recently been seen with his shirt off a lot, as he's filming his new film "Mike and Dave Need Wedding Dates" in Hawaii, according to E! News. The movie also features Adam Devine, Anna Kendrick and Aubrey Plaza. It's focused on two brothers, Efron and Devine, who are putting out personal ads to find a date for a wedding.

See Zac Efron on the big screen, and hopefully shirtless, soon when his film "We Are Your Friends" hits theaters August 28.

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