You'll Never Guess Who Joined Zac Efron on His Hawaiian Hike

Zac Efron spent part of his Memorial Day weekend hiking in Oahu, HI, and he had a few special guests along for the ride. In addition to Instagramming an epic salute to the troops and a glimpse at Workaholics star Adam DeVine, Zac was also spotted hitting the trails with none other than Anna Kendrick. Zac, Adam, and Anna are all set to star in the upcoming comedy Mike and Dave Need Wedding Dates, which explains why the three are spending time together. Prior to his stint in Hawaii, Zac was filming Dirty Grandpa in Georgia with Robert De Niro, where Zac fit in a little quality time with girlfriend Sami Miró. Keep reading for the pictures from Zac's hiking day.