"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 ...

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

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

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

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

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

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.

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

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' ...