The 'Neighbors' star, 27, kept a thin moustache, soul patch, and thicker facial hair on his chin, while sculpting the hair on top of his head to stick up in the front, reported Us magazine.
The next day, Efron attended the Treats! Halloween party at the Los Angeles Theatre with his current girlfriend Sam Miro, but covered his new facial hair with a mask.
The former Disney star stepped out with the model for the first time in late September after splitting from Michelle Rodriguez in August.