By Kelsey Glein
Updated Jan 22, 2016 @ 2:30 pm
Zac Efron - August 11, 2015
Credit: Samir Hussein/WireImage

Another day, another ab-baring snap of Zac Efron. Before his appearance on Jimmy Kimmel Live! last night, the actor took to Instagram to share a photo of himself sans shirt, and there's no question that he looks better than ever.

In the 'gram, Efron is sitting in his dressing room while getting his hair done by a stylist—however, it appears that the former High School Musical star wanted us to think his perfectly coifed 'do was au naturel. "I woke up like this @jimmykimmellive #dirtygrandpa," he captioned the sexy picture.

During his sit-down on the late night show, Kimmel played a clip of a teenage Efron doing the moonwalk in his real high school musical—and needless to say, it was pretty amazing. Need another dose of his good looks? Catch his film Dirty Grandpa with Robert De Niro, which hits theaters today.