Zac Efron & Dwayne 'The Rock' Johnson Film 'Baywatch' - First On Set Photos!

Zac Efron and Dwayne “The Rock” Johnson arrive for their first day on the set of their new Baywatch movie on Monday (February 22) in Boca Raton, Fla.

The 28-year-old actor showed off his muscles in a tight t-shirt while filming scenes on a boat!

The day before, The Rock posted a photo to Instagram of the whole cast at a table read.

“Like a proud papa silverback, just look at this talented cool/hot #Baywatch cast.. @ilfenator, @alexannadaddario, @zacefron, @priyankachopra, @kellyrohrbach, @thejonbass and some tatted up, bald brown man with a large head. This squad has been working extremely hard for months for these roles – the time has come – we start shooting TOMORROW. Let’s roll and bring the world some beach fun. #BAYWATCH #LifeguardsOnDuty #AndZacHasNiceTits,” he captioned the pic.

10+ pictures inside of Zac Efron on set…