Zac Efron Ends the 'WAYF' Tour By Baring His Bulging Biceps!

Zac Efron rolls up his shirt sleeve to reveal his bulging bicep at the We Are Your Friends tour after party on Friday night (August 21) in San Francisco, Calif.

The 27-year-old actor was joined by his co-star Emily Ratajkowski and their director Max Joseph for the final stop on their promo tour.

PHOTOS: Check out the latest pics of Zac Efron

“Bay Area! Stoked to be back in my home away from home #GoGiants Thank you for coming to the final screening of @wayfmovie! What did you think? #WAYFtour #SF #WAYF,” Zac captioned a video on Instagram from the screening.

FYI: Zac is wearing Nudie Jeans denim. Emily is wearing Alternative.