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

The “High School Musical” star, 38, was spotted sitting front and center at the show Tuesday, holding their little sister, Olivia, 5, on his lap.

Olivia wore a pink puff-sleeved dress while taking in the live competition, while Zac appeared to go casual in a dark button-down shirt over a white T-shirt.

Dylan, 33, and his partner Daniella Karagach just entered their tenth week in the competition, so fans have been perplexed as to why it’s taken the “Iron Claw” actor this long to show up — even Prince William made a surprise appearance before he did.

Fans repeatedly flooded social media to urge Zac to attend the show with an almost relentless stream of com

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