1
Dylan Efron
Zac Efron's little brother Dylan was thrust into the spotlight when a certain Instagram shot—where they both showed off their abs—revealed just how good those genes are. Facts you need to know: He's 23, he's an Aquarius, and he once wrote a poem in sixth grade about how his famous bro could be kind of a jackass. Awesome.
3
Austin Swift
The 23-year-old majored in film, TV, and theatre at the University of Notre Dame—and is no stranger to Hollywood events. He's been seen pretty much everywhere with his superstar sis—the Taylor Swift.
6
Monica Cruz
Monica is a Spanish actress and dancer, who has designed collections for Mango and appeared in ad campaigns alongside her older sister, Penelope.
7
Eduardo Cruz
While Eduardo is a singer who dated the likes of Eva Longoria. All, obviously, are beautiful.
8
Erika Smalls
Joan Smalls' little sister Erika Smalls got thrown into the
spotlight recently by starring alongside her sister in the newest Balmain campaign. She currently splits her time between Puerto Rico and New York.
9
Sebastian Theroux
Justin Theroux's 26-year-old brother for some reason caused quite the stir when he hung out in New York with his younger bro wearing matching leather jackets. The words "drool" and "hot" were used in various well-reported pieces.
10
Dave Franco
Okay, okay. So this one has been on the Hollywood radar for quite some time. But listen—let's just give credit where credit is due. Kid's funny and a little more understandable with his "art" than James. Case closed.
Samantha Leal
Senior Web Editor
I'm Sam, the senior editor at MarieClaire.com.
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