Happy Birthday, Zac Efron! See the “High School Musical” Star’s Cutest Photos with His 3 Siblings, Dylan, Olivia and Henry

Brendan LeSun, October 18, 2026 at 10:30 AM UTC

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Zac Efron with Henry and Olivia Efron; Zac Efron and Dylan EfronCredit: Zac Efron/Instagram;officialdwts/X

As the eldest brother, Zac Efron dotes on all his younger siblings.

Zac’s parents Starla Baskett and David Efron welcomed him and his brother Dylan in 1987 and 1992, respectively. After Starla and David’s divorce in 2016, David remarried, and with his new wife, they had two children: Zac’s half-siblings Olivia and Henry.

Both Zac and Dylan share a close bond with their younger brother and sister, frequently sharing goofy snaps on social media. During Dylan’s Dancing with the Stars run, he dedicated his dance to “Rewrite the Stars” — from Zac’s movie The Greatest Showman — to Olivia.

As the High School Musical actor celebrates his 39th birthday on Oct. 18, 2026, see the Efrons’ most adorable sibling photos.

01 of 16

Now Introducing...

Dylan Efron and Zac EfronCredit: Zac Efron Instagram

Zac celebrated Dylan’s 25th birthday in 2017 with a selfie of the two — at the time, a rare sighting.

“This is my brother Dylan- it’s his birthday today- I love the crap out of him,” the star wrote on Instagram.

02 of 16

What a View

Zac Efron and Dylan EfronCredit: Zac Efron/Instagram

Five years later, he marked another milestone for Dylan with a belated 30th birthday post. “30 years and we’re still up to the same $&!+,” he captioned the post.

03 of 16

Flower Crown

Zac Efron and his sister Olivia.Credit: Zac Efron Instagram

Zac looked lovingly into his baby sister’s eyes in a photo shared on Olivia’s 3rd birthday.

04 of 16

Abs-olutely Fantastic

Dylan Efron and Zac EfronCredit: Zac Efron/Instagram

Dylan and Zac showed off their fit physiques on a sibling boat trip.

05 of 16

Clowning Around

Zac Efron with his siblings, Olivia and HenryCredit: Zac Efron Instagram

The Iron Claw star had his hands full with Henry and Olivia as the three took a trip to the circus.

06 of 16

Hanging Out

Zac Efron and Dylan Efron with thier siblings Olivia and Henry.Credit: Dylan Efron Instagram

In a rare snap of all four siblings, Zac and Dylan horsed around with Olivia and Henry by picking them up by their legs.

“I know exactly the type of big brother I want to be for Olivia and Henry because you were that brother to me,” Dylan wrote to Zac on the Disney alum’s 35th birthday.

07 of 16

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Star for a Star

David Efron, Zac Efron, Starla Baskett and Dylan EfronCredit: Leon Bennett/Getty

David and Starla joined their two sons to commemorate Zac’s Hollywood Walk of Fame star.

08 of 16

Take It or Leaf It

Zac Efron and his brother Henry.Credit: Dylan Efron Instagram

Dylan posted an adorable picture of Henry and Zac, who was having a goofy moment to make his little bro laugh.

09 of 16

Who Let the Dog Out

Dylan Efron and his sister, OliviaCredit: Dylan Efron Instagram

Ahead of Olivia’s third birthday, Dylan asked his followers for gift suggestions. “Just tryin to stay her favorite brother over here,” he captioned the smiley photo.

10 of 16

Story Time

Zac Efron and Olivia EfronCredit: Zac Efron/Instagram

For Valentine’s Day, only one person had Zac’s heart: his beloved baby sister!

11 of 16

Beachy Keen

Zac Efron and Olivia EfronCredit: Zac Efron/Instagram

Zac and Olivia rang in the first day of spring with a sunny trip to the beach.

12 of 16

To the Top

Olivia Efron, Henry Efron and Dylan EfronCredit: dylanefron/Instagram

Henry and Olivia accompanied Dylan to his Dancing with the Stars rehearsals with Daniella Karagach.

13 of 16

Dance the Night

Olivia Efron and Zac EfronCredit: Disney/Eric McCandless

At the end of his Dedication Night dance, Olivia joined Dylan on the floor for a few steps.

14 of 16

Show of Support

Julianne Hough, Zac Efron and Olivia EfronCredit: Eric McCandless/Disney via Getty

Zac (seen with Julianne Hough) made his first Dancing with the Stars appearance to support his younger brother (and give his little sis a boost) during the semifinals.

15 of 16

Bro Backstage

Dylan Efron and Zac EfronCredit: officialdwts/X

The official DWTS account shared a BTS picture of the brothers ahead of Prince Night.

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Catching Some Sun

Zac Efron and Dylan EfronCredit: Dylan Efron/Instagram

The Efron bros were “taking it easy” in a shirtless summer vacation photo that Dylan shared on Instagram.

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Source: “AOL Entertainment”