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Zac Efron shows off his ripped abs alongside equally buff brother Dylan during shirtless boat day

Zac, 38, and Dylan, 34, enjoyed a boat day with friends, with the siblings each donning black swim trunks as they displayed ...

Zac & Dylan Efron show off their rock-hard abs in viral new vacay pics

In a new Instagram carousel posted by Dylan Efron, the handsome reality star poses shirtless next to his older brother as they take in the views on the water. Although Zac Efron might not be wearing ...