Zac Efron is an Undercover Brother

Zac Efron hides under a hoodie and sunglasses as he goes for his daily workout at a gym in Los Angeles on Wednesday.

Before heading to the gym, the High School Musical star dropped off girlfriend Vanessa Hudgens back at her house earlier that morning.

Zac, 20, wore a Nike zip-up hoodie and Arroyo Grande athletic shorts. (He attended Arroyo Grande High School.)

10+ pictures inside of Zac Efron, the undercover brother…