The newly-single star wished little brother Dylan Efron a happy Sibling Day with a new photo – albeit three weeks late. "We make a pretty d--- good team," Efron wrote on Instagram.
But who is Dylan – other than one-half of Hollywood’s sexiest brothers? Here's everything we know about your newest celebrity sibling crush.
1. He graduated from Cal Poly – San Luis Obispo with an Economics Degree.
Dylan was a member of the class of 2013 at California Polytechnic State University's San Luis Obispo campus, graduating with a Bachelor of Science degree in Economics.
The hunk was definitely a stand-out student: his senior project called "Examining the California Film and Television Tax Credit Program" is prominently featured on the school's wesbsite as "outstanding."
2. He's also worked in film.
While his big brother's at home onscreen, it seems that Dylan has spent time on the production side of Hollywood.
He worked as an assistant to executive producer Ravi Mehta on 2015's Get Hard – a comedy starring Will Ferrell and Kevin Hart.
3. He's a poet.
Dylan and Zac, 28, may be close now, but back in the day, the former wasn't necessarily enamoured of his older brother.
In a poem written by Dylan in the sixth grade – and revealed on social media by the Baywatch star – the 24-year-old said his brother "thinks he is the queen."
"If he lost me at a show, I'll bet he would not care a bit," Dylan's poem, "A Brotherly Thing," read. "He won't even try to look, but my mom would throw a fit."
Dylan admitted, however, that Zac sometimes "isn't that bad," and supports him at sporting events. "Brothers have to fight, I think," he contended.
Talking about the poem on Late Night with Seth Meyers last summer, Efron said, "His poems got way better. He's way cooler than me."
4. He's also perfected the beach body.
Dylan first ignited a media firestorm in July 2015, when Zac shared a shirtless photo with the college grad on Instagram.
In the image, the actor caught a piggyback ride from Dylan – the latter's chiselled abdominals prominently displayed.
"THE EFRON GENES," one Twitter user summed it up at the time.
5. He's a Lakers fan.
Zac and Dylan grew up with parents David Efron and Starla Baskett in San Louis Obispo, California, so naturally, they're long-time fans of the nearby Los Angeles Lakers.
The brothers have been spotted at games over the years, sitting courtside and cheering on the NBA team to victory.