Sexy Siblings! Zac Efron Shares Shirtless Pic With Brother Dylan

Photo: Instagram
It's hard to say who's hotter in this pic of Zac Efron and his younger brother Dylan.
The 27-year-old heartthrob posted the Instagram image on Monday showing him and his baby bro shirtless and goofing around. He hashtagged the pic, "#brothers."

This wouldn't be the first time we've gushed over the Efron boys. This past May, Zac shared a poem that Dylan penned about his famous sibling for an old homework assignment. The poem was titled "A Brotherly Thing."
"My brother is a movie star, and is only 16," Dylan, who's now in his early 20's, wrote. "He doesn't have a job yet. Still, he thinks he is the queen."
Showing love for his older brother, Dylan added, "I guess he isn't that bad, if I think about it twice. He helps me with my homework, and always gives advice."
Who do you think is hotter: Zac or Dylan?