EXCLUSIVE: ZAC EFRON GREEN WITH ENVY? BROTHER DYLAN’S SHIRTLESS SELFIES SPARK SIBLING RIVALRY

“He Used to Be the Hot One!” — Sources Say Zac Isn’t Loving Dylan’s Newfound Thirst Trap Fame

There is a new Efron heartthrob in town — and it’s not Zac.

Insiders say the High School Musical alum is feeling a little salty over younger brother Dylan Efron’s rise to social media stardom, especially thanks to his endless stream of shirtless adventure pics and gym-thirst selfies that have fans — and fitness brands — drooling.

“Zac used to be the one everyone talked about,” a source close to the brothers said. “Now it’s all, ‘Who’s that Efron?’”

While Zac, 36, has kept a lower profile in recent years, focusing on dramatic roles and recovering from a jaw injury, Dylan has been busy building his own brand — one that involves hiking cliffs, diving into waterfalls, and looking like he lives in a protein shake commercial.

And it hasn’t gone unnoticed.

“There’s definitely a little sibling rivalry,” the insider dished. “Zac loves his brother, but he’s competitive — and yeah, he notices when Dylan’s the one trending.”

Dylan, 33, who started as a producer and travel vlogger, has amassed a cult following of his own. While Zac once ruled the internet with abs and charm, fans are now flooding Dylan’s comments with heart emojis and fire GIFs.

“Zac’s still Zac,” the source added. “But it’s gotta sting just a little when your little brother becomes the internet’s new obsession.”

So is it playful competition or quiet jealousy?

Only the Efrons know for sure — but one thing’s clear: there’s a new six-pack stealing the spotlight.