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

Zac Efron cheered on his brother Dylan during the semi-finals of 'Dancing with the Stars' on Nov. 18. Zac's appearance in the ...

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

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

The Iron Claw star may not know scores, be he knows how to support his brother. Via his Instagram stories, Zac Efron ...

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

Kaitlyn Bristowe was totally starstruck seeing Zac Efron at Dancing With the Stars — just like Us. "I'm not gonna talk about ...

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

Zac Efron finally visited "Dancing With the Stars" to support his brother Dylan — and it seems like he wasn't exactly sure ...

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.

Zac Efron and his brother, Dylan Efron, have a tight bond with their parents, Starla and David. Here's everything to know ...