"The Iron Claw" star made his first cameo in the live audience, rooting for his younger sibling on Prince Night.

Zac Efron finally made an appearance on “Dancing With the Stars” in support of his brother Dylan Efron during the semifinals.

Zac Efron finally made his “Dancing With the Stars” appearance during Prince Night, just in time to support his younger ...

Actor Zac Efron stopped by "Dancing with the Stars" to support his brother Dylan Efron, who is competing on season 34.

Zac Efron was the first Hollywood star in his family, but his younger brother, Dylan Efron, has followed in his footsteps, ...

"Dancing With The Stars" welcomed another star in Season 34 when Zac Efron made a surprise appearance to support brother ...

Zac Efron made a long-awaited appearance in the Dancing With the Stars season 34 semifinals audience to support his brother, ...

Zac Efron was spotted in the 'Dancing With the Stars' audience as Dylan Efron competed for a spot in the season 34 finale ...

Zac Efron accidentally stole the spotlight at the Dancing with the Stars semifinals, and he wasn’t even dancing.

After Zac Efron made a surprise appearance for little brother Dylan Efron's Dancing With the Stars semifinals performance Nov. 18, the Traitors alum shared how special it was to E! News.

Fans completely lost it when Zac Efron popped up at the Dancing With the Stars ballroom to cheer on his brother Dylan Efron.

Dyan Efron 's stellar looks over the years will make you wanna DANCE! Here is a 17-year-old version of a shaggy Dylan rockin' ...